American Toad (Anaxyrus americanus) lives in moist forests across Eastern North America. It feeds on insects and worms. Its conservation status is Least Concern.
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The American toad deposits its offspring in two elongated gelatinous ropes, each containing between 2,000 and 20,000 tiny black eggs only 1-2 mm across. These egg strings are laid in shallow water where they become tangled around submerged vegetation or rest on the pond bottom. The surrounding jelly keeps the clutch moist and protected until the embryos hatch within a few days.
American toad tadpoles harbour a mutualistic partnership with Chlorogonium algae, a relationship that speeds their growth and leads to faster development than typical tadpoles. This accelerated maturation can be influenced by the type of leaf litter in their nursery; invasive plants such as autumn olive or purple loosestrife raise trematode parasite loads, likely because they also promote quicker development compared with native vegetation.
A single American toad tadpole is poisonous enough to kill a fish that attempts to eat it, and most fish quickly learn to avoid these toxic larvae after such encounters. The tadpoles produce skin chemicals that deter predators, and they further reduce risk by staying in very shallow, densely vegetated water and swimming in tight schools during daylight. These combined defences make them a hazardous prey item for most aquatic hunters.
Genetic evidence suggests the species arrived from South America before the Panama land bridge formed. Scientists think the ancestors rafted across the ocean to reach North America.
Some American toads live beyond 30 years, an exceptional lifespan for amphibians. A female over 13 cm long is now in her late thirties, confirming their long-term survival.
Sources
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As the sun sets over the forest floor, the American Toad emerges from its hiding places, its warty skin glistening with dew as it begins its nocturnal wanderings. With a slow, deliberate gait, it moves through the underbrush, its golden eyes blinking wisely as it navigates a world of hidden dangers and secret delights. In this quiet, unassuming way, the American Toad goes about its business, a humble but resilient presence in the natural world.
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