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Which is the odd one out: Dolphin, Whale, Shark, Seal?
Shark
Sharks are fish, dolphins, whales and seals are all mammals that returned to the sea from land ancestors.
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Which is the odd one out: Platypus, Kangaroo, Koala, Wombat?
Platypus
Kangaroos, koalas and wombats are marsupials, the platypus is a monotreme, the only group of egg-laying mammals.
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Which is the odd one out: Cobra, Mamba, Viper, Python?
Python
Cobras, mambas and vipers are all venomous, pythons kill by constriction and produce no venom at all.
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Which is the odd one out: Spider, Scorpion, Tick, Butterfly?
Butterfly
Spiders, scorpions and ticks are arachnids with 8 legs, butterflies are insects with just 6 legs.
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Which is the odd one out: Lion, Leopard, Cheetah, Hyena?
Hyena
Lions, leopards and cheetahs are all true cats (Felidae), hyenas are in their own family Hyaenidae, more closely related to mongooses.
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Which is the odd one out: Ostrich, Emu, Flamingo, Kiwi?
Flamingo
Ostriches, emus and kiwis are all flightless birds, flamingos are strong fliers, capable of travelling hundreds of kilometres overnight.
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Which is the odd one out: Penguin, Seal, Sea Lion, Walrus?
Penguin
Seals, sea lions and walruses are all mammals, penguins are birds, despite being unable to fly and spending most of their lives in water.
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Which is the odd one out: Salmon, Tuna, Whale Shark, Swordfish?
Whale Shark
Salmon, tuna and swordfish are bony fish, the whale shark is a cartilaginous fish with a skeleton made entirely of cartilage, like rays and skates.
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Which is the odd one out: Eagle, Falcon, Hawk, Owl?
Owl
Eagles, falcons and hawks are diurnal raptors, owls belong to a completely separate order (Strigiformes) and are more closely related to nightjars.
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Which is the odd one out: Crocodile, Alligator, Gharial, Komodo Dragon?
Komodo Dragon
Crocodiles, alligators and gharials are all crocodilians, the Komodo dragon is a monitor lizard, a completely different reptile group.
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Which is the odd one out: Gorilla, Chimpanzee, Gibbon, Human?
Gibbon
Gorillas, chimpanzees and humans are all great apes, gibbons are lesser apes in a separate family that diverged from great apes around 17 million years ago.
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Which is the odd one out: Blue Whale, Sperm Whale, Whale Shark, Humpback Whale?
Whale Shark
Blue, sperm and humpback whales are all mammals that breathe air, the whale shark is a fish, entirely unrelated to whales despite its name.
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Which is the odd one out: Cobra, Rattlesnake, Mamba, Boa Constrictor?
Boa Constrictor
Cobras, rattlesnakes and mambas are all highly venomous, boa constrictors kill by squeezing their prey and produce no venom at all.
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Which is the odd one out: Octopus, Squid, Cuttlefish, Nautilus?
Nautilus
Octopuses, squid and cuttlefish have all evolved away from their shells, the nautilus retains its original shell and is the most ancient of the four.
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Which is the odd one out: Bumblebee, Wasp, Hornet, Dragonfly?
Dragonfly
Bumblebees, wasps and hornets are all Hymenoptera, dragonflies belong to order Odonata, an ancient insect group that predates dinosaurs by 150 million years.
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Which is the odd one out: Red Panda, Giant Panda, Brown Bear, Polar Bear?
Red Panda
Giant pandas, brown bears and polar bears are all true bears (Ursidae), the red panda belongs to its own family Ailuridae, more closely related to raccoons.
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Which is the odd one out: Gorilla, Mandrill, Baboon, Macaque?
Gorilla
Mandrills, baboons and macaques are all Old World monkeys with tails, gorillas are apes, with no tail and a fundamentally different body structure.
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Which is the odd one out: Hummingbird, Bat, Butterfly, Flying Fish?
Flying Fish
Hummingbirds, bats and butterflies all achieve true powered flight, flying fish can only glide above the water's surface, propelled by their forked tail.
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Which is the odd one out: Scorpion, Tarantula, Tick, Centipede?
Centipede
Scorpions, tarantulas and ticks are all arachnids with 8 legs, centipedes are myriapods with one pair of legs per body segment, and can have 30 to 354 legs.
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Which is the odd one out: Bat, Flying Fox, Fruit Bat, Flying Squirrel?
Flying Squirrel
Bats, flying foxes and fruit bats are all true bats (Chiroptera) capable of powered flight, flying squirrels are rodents that only glide using a skin membrane.
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Which is the odd one out: Clownfish, Jellyfish, Sea Anemone, Coral?
Clownfish
Jellyfish, sea anemones and corals are all invertebrates, clownfish are vertebrates with a proper spine and skeleton.
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Which is the odd one out: Snow Leopard, Clouded Leopard, Cheetah, Leopard?
Cheetah
Snow leopards, clouded leopards and leopards are in the Panthera lineage, cheetahs belong to genus Acinonyx, cannot roar, and are more closely related to pumas.
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Which is the odd one out: Dolphin, Orca, Porpoise, Dugong?
Dugong
Dolphins, orcas and porpoises are all cetaceans, the dugong is a sirenian, more closely related to elephants than to any whale or dolphin.
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Which is the odd one out: Frog, Toad, Newt, Crocodile?
Crocodile
Frogs, toads and newts are all amphibians that need water to reproduce, crocodiles are reptiles with waterproof skin and a completely separate evolutionary lineage.
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Which is the odd one out: Clam, Oyster, Mussel, Barnacle?
Barnacle
Clams, oysters and mussels are all bivalve molluscs, barnacles look similar but are crustaceans, more closely related to crabs and lobsters than to any mollusc.
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Which is the odd one out: Hare, Rabbit, Pika, Squirrel?
Squirrel
Hares, rabbits and pikas are all lagomorphs, squirrels are rodents, a completely separate mammal order, despite the superficial similarities.
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Which is the odd one out: Moose, Elk, Reindeer, Bison?
Bison
Moose, elk and reindeer are all deer (Cervidae) with antlers they shed yearly, bison are bovids with permanent horns and a body plan closer to cattle.
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Which is the odd one out: Puma, Jaguar, Leopard, Lion?
Puma
Jaguars, leopards and lions are all Panthera big cats that can roar, pumas belong to genus Puma, cannot roar, and are more closely related to cheetahs.
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Which is the odd one out: Crab, Lobster, Shrimp, Woodlouse?
Woodlouse
Crabs, lobsters and shrimp are all marine decapod crustaceans, woodlice are the only crustaceans fully adapted to life on land, in a completely different order.
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Which is the odd one out: Rattlesnake, Copperhead, Cottonmouth, Corn Snake?
Corn Snake
Rattlesnakes, copperheads and cottonmouths are all venomous pit vipers, the corn snake is completely harmless, and is often mistaken for the copperhead.
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Which is the odd one out: Piranha, Catfish, Electric Eel, Caiman?
Caiman
Piranhas, catfish and electric eels are all Amazon fish, caimans are reptiles, ancient relatives of crocodiles that share the same river systems.
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Which is the odd one out: Seahorse, Sea Dragon, Pipefish, Sea Cucumber?
Sea Cucumber
Seahorses, sea dragons and pipefish are all closely related syngnathid fish, sea cucumbers are echinoderms, related to starfish and sea urchins.
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Which is the odd one out: Chipmunk, Prairie Dog, Groundhog, Rabbit?
Rabbit
Chipmunks, prairie dogs and groundhogs are all squirrel-family rodents (Sciuridae), rabbits are lagomorphs, a separate mammal order entirely.
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Which is the odd one out: Scorpion, Crab, Lobster, Crayfish?
Scorpion
Crabs, lobsters and crayfish are all crustaceans with ten legs, scorpions are arachnids with eight legs, more closely related to spiders.
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Which is the odd one out: Jellyfish, Sea Anemone, Coral, Sea Urchin?
Sea Urchin
Jellyfish, sea anemones and corals are all cnidarians defined by their stinging cells, sea urchins are echinoderms, related to starfish.
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Which is the odd one out: Zebra, Horse, Donkey, Rhinoceros?
Rhinoceros
Zebras, horses and donkeys are all equids in the same family, rhinoceroses are in their own family Rhinocerotidae, though both groups are odd-toed ungulates.
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Which is the odd one out: Chimpanzee, Bonobo, Gorilla, Orangutan?
Orangutan
Chimpanzees, bonobos and gorillas are all African great apes, orangutans are the only Asian great apes, diverging from African apes around 12 million years ago.
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Which is the odd one out: Peregrine Falcon, Merlin, Kestrel, Sparrowhawk?
Sparrowhawk
Peregrine falcons, merlins and kestrels are all true falcons (Falconidae), sparrowhawks are accipiters (Accipitridae), more closely related to eagles.
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Which is the odd one out: Porcupine, Hedgehog, Echidna, Armadillo?
Echidna
Porcupines, hedgehogs and armadillos are all placental mammals, the echidna is a monotreme, one of only five egg-laying mammals, more closely related to the platypus.
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Which is the odd one out: Atlantic Puffin, Razorbill, Common Guillemot, Gannet?
Gannet
Puffins, razorbills and guillemots are all auks (Alcidae), gannets are sulids, more closely related to pelicans than to any auk.
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Which is the odd one out: Hammerhead Shark, Bull Shark, Nurse Shark, Sawfish?
Sawfish
Hammerhead, bull and nurse sharks are all true sharks, sawfish are actually rays, their gill slits on the underside and flattened body revealing their true identity.
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Which is the odd one out: Bat, Flying Fox, Fruit Bat, Flying Lemur?
Flying Lemur
Bats and flying foxes are all true bats (Chiroptera) capable of powered flight, flying lemurs only glide and are actually more closely related to primates than to bats.
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Which is the odd one out: Cobra, Sea Snake, Coral Snake, King Snake?
King Snake
Cobras, sea snakes and coral snakes are all elapids, highly venomous snakes. King snakes are completely non-venomous constrictors that mimic coral snake colours for protection.
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Which is the odd one out: Koala, Kangaroo, Wombat, Rabbit?
Rabbit
Koalas, kangaroos and wombats are all marsupials, rabbits are placental mammals, a completely separate evolutionary line.
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Which is the odd one out: Bee, Wasp, Ant, Beetle?
Beetle
Bees, wasps and ants are all Hymenoptera, beetles belong to Coleoptera, the most diverse insect order with hardened wing cases.
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Which is the odd one out: Giraffe, Camel, Horse, Cow?
Horse
Giraffes, camels and cows are even-toed ungulates (Artiodactyla), horses are odd-toed (Perissodactyla), a completely separate order.
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Which is the odd one out: Shark, Ray, Skate, Sturgeon?
Sturgeon
Sharks, rays and skates are cartilaginous fish, sturgeons have bony skeletons and are true bony fish (Osteichthyes).
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Which is the odd one out: Tarantula, Scorpion, Tick, Centipede?
Centipede
Tarantulas, scorpions and ticks are arachnids with 8 legs, centipedes are myriapods with one pair of legs per segment, often 30+ pairs.
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Which is the odd one out: Toucan, Macaw, Hornbill, Kingfisher?
Hornbill
Toucans, macaws and kingfishers are all Coraciiformes-adjacent, hornbills are technically in Bucerotiformes, a separate order.
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Which is the odd one out: Salmon, Trout, Eel, Pike?
Eel
Salmon, trout and pike are ray-finned fish with typical body shapes, eels are elongated snake-like fish in order Anguilliformes.
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Which is the odd one out: Cuttlefish, Squid, Octopus, Starfish?
Starfish
Cuttlefish, squid and octopus are cephalopod molluscs, starfish are echinoderms with five-fold symmetry, not molluscs.
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Which is the odd one out: Horse, Donkey, Zebra, Tapir?
Tapir
Horses, donkeys and zebras are all equids, tapirs are a separate family, though still odd-toed ungulates.
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Which is the odd one out: Honey Bee, Bumble Bee, Carpenter Bee, Hoverfly?
Hoverfly
Honey, bumble and carpenter bees are all true bees, hoverflies are flies that mimic bee coloring as camouflage.
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Which is the odd one out: Peacock, Pheasant, Wild Turkey, Ostrich?
Ostrich
Peacocks, pheasants and turkeys are all Galliformes, ostriches are ratites, ancient flightless birds from a completely different lineage.
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Which is the odd one out: Bottlenose Dolphin, Orca, Beluga, Manatee?
Manatee
Dolphins, orcas and belugas are all cetaceans, manatees are sirenians, more closely related to elephants than to any whale or dolphin.
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Which is the odd one out: Spider, Scorpion, Horseshoe Crab, True Crab?
True Crab
Spiders, scorpions and horseshoe crabs are all chelicerates, true crabs are crustaceans, more closely related to shrimp and lobsters.
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Which is the odd one out: Vulture, Condor, Eagle, Stork?
Stork
Vultures, condors and eagles are all Accipitriformes-related raptors, storks are Ciconiiformes, a completely separate order.
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Which is the odd one out: Orangutan, Chimpanzee, Gorilla, Macaque?
Macaque
Orangutans, chimpanzees and gorillas are all great apes, macaques are Old World monkeys with tails, a separate primate family.
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Which is the odd one out: Parrot, Cockatoo, Macaw, Hornbill?
Hornbill
Parrots, cockatoos and macaws are all Psittaciformes, hornbills belong to Bucerotiformes, a separate bird order.
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Which is the odd one out: Coyote, Gray Wolf, Dingo, Hyena?
Hyena
Coyotes, wolves and dingoes are all Canidae, hyenas are Hyaenidae, feliforms closer to mongooses and cats than to dogs.
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Which is the odd one out: Emperor Penguin, King Penguin, Rockhopper, Puffin?
Puffin
Emperor, king and rockhopper penguins are all Sphenisciformes, puffins are auks (Alcidae), capable of flight.
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Which is the odd one out: Alligator, Crocodile, Caiman, Monitor Lizard?
Monitor Lizard
Alligators, crocodiles and caimans are all Crocodilia, monitor lizards are in a completely separate reptile order.
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Which is the odd one out: Anteater, Armadillo, Sloth, Pangolin?
Pangolin
Anteaters, armadillos and sloths are all xenarthrans, pangolins are Pholidota, evolving scaly armour independently in Africa and Asia.
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Which is the odd one out: Bullfrog, Tree Frog, Toad, Salamander?
Salamander
Bullfrogs, tree frogs and toads are all Anura (tailless amphibians), salamanders are Urodela, amphibians that keep their tails as adults.
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Which is the odd one out: Lion, Tiger, Jaguar, Cheetah?
Cheetah
Lions, tigers and jaguars can all roar, they're in genus Panthera. Cheetahs are Acinonyx, cannot roar, and have non-retractable claws.
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Which is the odd one out: Grasshopper, Cricket, Cicada, Mantis?
Mantis
Grasshoppers, crickets and cicadas are sound-making insects, praying mantises are predators in order Mantodea, hunting silently.
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Which is the odd one out: Sea Horse, Pipefish, Seadragon, Eel?
Eel
Sea horses, pipefish and seadragons are all syngnathids, eels are in a completely different fish order (Anguilliformes).
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Which is the odd one out: Red Fox, Arctic Fox, Kit Fox, Raccoon?
Raccoon
Red, arctic and kit foxes are all Canidae, raccoons are Procyonidae, a separate family closer to coatis and kinkajous.
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Which is the odd one out: Mule, Hinny, Zebroid, Liger?
Liger
Mules, hinnies and zebroids are equid hybrids, ligers are lion-tiger hybrids, from the Panthera genus.
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Which is the odd one out: Common Dolphin, Porpoise, Orca, Sea Lion?
Sea Lion
Dolphins, porpoises and orcas are all cetaceans, sea lions are pinnipeds (Carnivora), more closely related to bears.
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Which is the odd one out: Bedbug, Flea, Louse, Mosquito?
Mosquito
Bedbugs, fleas and lice are wingless parasites that live on hosts, mosquitoes are winged Diptera, landing to feed then flying away.
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Which is the odd one out: Beluga, Blue Whale, Humpback Whale, Sperm Whale?
Beluga
Blue, humpback and sperm whales are all large whales, belugas are actually dolphins in family Monodontidae, along with narwhals.
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Which is the odd one out: Caribou, Moose, Elk, Bison?
Bison
Caribou, moose and elk are all deer (Cervidae), bison are bovids, relatives of cattle and buffalo.
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Which is the odd one out: Cobra, Viper, Rattlesnake, Boa?
Boa
Cobras, vipers and rattlesnakes are all venomous, boas kill by constriction and produce no venom at all.
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Which is the odd one out: Mole, Shrew, Hedgehog, Bat?
Bat
Moles, shrews and hedgehogs are all insectivores (Eulipotyphla), bats are in their own order Chiroptera, the only flying mammals.
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Which is the odd one out: Crane, Heron, Stork, Flamingo?
Flamingo
Cranes, herons and storks are tall wading birds in similar orders, flamingos are in their own order Phoenicopteriformes, closest to grebes.
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Which is the odd one out: Chimpanzee, Bonobo, Human, Baboon?
Baboon
Chimps, bonobos and humans are all great apes sharing 98%+ DNA, baboons are Old World monkeys, an entirely separate primate group.
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Which is the odd one out: Swallow, Swift, Martin, Hummingbird?
Hummingbird
Swallows, swifts and martins are all aerial insectivores in order Apodiformes/Passeriformes, hummingbirds are also Apodiformes, but nectarivores.
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Which is the odd one out: Chameleon, Iguana, Gecko, Salamander?
Salamander
Chameleons, iguanas and geckos are reptiles with scales, salamanders are amphibians with moist skin and gills in larvae.
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Which is the odd one out: Monarch Butterfly, Moth, Skipper, Dragonfly?
Dragonfly
Monarch butterflies, moths and skippers are all Lepidoptera, dragonflies are Odonata, an ancient group predating the dinosaurs.
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Which is the odd one out: Orangutan, Gibbon, Siamang, Macaque?
Macaque
Orangutans, gibbons and siamangs are all apes, macaques are Old World monkeys, a separate primate family with tails.
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Which is the odd one out: Snowy Owl, Barn Owl, Great Horned Owl, Peregrine Falcon?
Peregrine Falcon
Snowy, barn and great horned owls are all Strigiformes, peregrine falcons are Falconiformes, more closely related to parrots than to owls.
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Which is the odd one out: Giant Panda, Red Panda, Sloth Bear, Sun Bear?
Red Panda
Giant pandas, sloth bears and sun bears are all true bears (Ursidae), red pandas are Ailuridae, closer to raccoons and weasels.
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Which is the odd one out: Cat, Dog, Ferret, Rabbit?
Rabbit
Cats, dogs and ferrets are all Carnivora, rabbits are Lagomorpha, a completely separate mammal order.
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Which is the odd one out: Dung Beetle, Stag Beetle, Ladybug, Water Strider?
Water Strider
Dung, stag and ladybug beetles are all Coleoptera, water striders are Hemiptera (true bugs), recognisable by their piercing mouthparts.
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Which is the odd one out: Manatee, Dugong, Seal, Dolphin?
Seal
Manatees, dugongs and dolphins are all aquatic mammals, wait, seals are too. But manatees/dugongs are sirenians and dolphins are cetaceans, while seals are pinnipeds (carnivores).
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Which is the odd one out: Gila Monster, Komodo Dragon, Beaded Lizard, Cobra?
Cobra
Gila monsters, Komodo dragons and beaded lizards are all venomous lizards, cobras are snakes, a separate evolutionary lineage.
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Which is the odd one out: Rhea, Emu, Ostrich, Flamingo?
Flamingo
Rheas, emus and ostriches are ratites (flightless running birds), flamingos are strong fliers in their own separate order.
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Which is the odd one out: Mosquito, Housefly, Fruitfly, Bee?
Bee
Mosquitoes, houseflies and fruitflies are all Diptera (two-winged), bees are Hymenoptera with four wings and a much more complex social life.
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Which is the odd one out: Giant Squid, Colossal Squid, Humboldt Squid, Nautilus?
Nautilus
Giant, colossal and Humboldt squid are modern shell-less cephalopods, nautiluses are ancient relatives that still keep their coiled shell.
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Which is the odd one out: Jaguarundi, Ocelot, Margay, Raccoon?
Raccoon
Jaguarundis, ocelots and margays are all small wild cats (Felidae), raccoons are Procyonidae, a completely different family.
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Which is the odd one out: Scorpion, Jumping Spider, Orb Weaver, Earwig?
Earwig
Scorpions, jumping spiders and orb weavers are arachnids with 8 legs, earwigs are insects (Dermaptera) with 6 legs and characteristic rear pincers.