Hector's Dolphin (Cephalorhynchus hectori) lives in coastal waters across New Zealand. It feeds on fish and squid. Its conservation status is Endangered.
Fascinating facts about the Hector's Dolphin
- Hector's dolphins are the world's tiniest dolphin, with adults measuring just 1.2-1.6 m (3 ft 11 in, 5 ft 3 in) and weighing 40-60 kg (88-132 lb). They are found in shallow, murky coastal waters less than 50 m deep, exposing them to fishing gear that operates in the same shallow zones.
- Females grow 5-7 % longer than males, reaching up to 162.5 cm, while males top out at about 146 cm. This sexual dimorphism influences group composition: larger females often lead nursery groups, while smaller males tend to form loose, mixed-sex aggregations, shaping the species' fluid social structure.
- A single male's testes can weigh up to 2.9 % of his body mass. This extreme investment fuels a promiscuous mating system and aggression is low, explaining why sexual behaviour spikes in larger mixed-sex groups and why the species shows weak long-term pair bonds.
- Population surveys estimate just 48 Māui dolphins remain, and 59 in 2010/2011. Such a tiny gene pool makes the subspecies vulnerable to inbreeding and stochastic events, pushing it toward extinction unless bycatch is halted.
- Gillnet bycatch kills 19-93 South Island Hector's dolphins each year, while trawl nets add another 0.2-26.6 deaths; together they represent the greatest human-caused mortality.
Sources
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At a glance
RangeNew Zealand
HabitatCoastal waters
DietFish and squid
About the Hector's Dolphin
In the shimmering coastal waters of New Zealand, the Hector's Dolphin glides with effortless elegance, its sleek, gray form weaving through the waves with a gentle precision that belies its energetic and playful nature. As it swims, its dorsal fin slices through the surface, leaving behind a trail of glittering droplets that dance in the sunlight, a mesmerizing display of aquatic agility. With its population dwindling, this enchanting creature's very existence is a poignant reminder of the fragility and beauty of the ocean's most vulnerable inhabitants.
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