Quick facts

Meet the Trinidad Stream Frog

The Trinidad stream frog (Mannophryne trinitatis), sometimes called the yellow-throated frog, is a small but fascinating amphibian found only in Trinidad. Adults are tiny, growing up to just 2.5 cm, with females slightly larger than males. What makes them easy to tell apart? Their throats! Males have grey throats and loud, inflatable vocal sacs for calling, while females sport a bright yellow throat—a striking feature they use to defend their territory.

Where They Live

These frogs love mountain streams surrounded by moist, undisturbed forests, mainly in the Northern and Central Ranges of Trinidad. They cling to rocks and boulders along flowing water and rely on their cryptic brown coloration to stay hidden from predators, unlike the flashy, toxic poison frogs of other families.

A Social Life Like No Other

Interestingly, females are the territorial ones. They guard small patches of rock or streambed, puffing out their bright yellow throats to warn intruders. If warnings are ignored, physical grappling can follow, with females sometimes confronting other females—or even males carrying tadpoles. Males, meanwhile, court from a safe distance using calls and colour changes, turning from pale brown to black to impress females.

Feeding

Trinidad stream frogs feed on small insects and arthropods, from fruit flies to cowpea beetles. Tadpoles, on the other hand, are herbivores, munching on leaf litter and algae. Males can even continue feeding while caring for eggs and transporting tadpoles.

Love and Family Life

These frogs have a role reversal in reproduction: females defend territories, while males take care of the young. After mating, females follow the calling male to oviposition sites—usually a rock crevice or a patch of leaves. Males tend the eggs and later carry tadpoles to safe pools, avoiding predators like small fish and shrimp. Tadpoles develop for about 56 days before metamorphosing into tiny juveniles, which grow fast and reach maturity in as little as five months.

Staying Safe

Trinidad stream frogs are clever at avoiding predators. Males choose deposition sites carefully, and tadpoles respond instinctively to chemical cues from predators—a behaviour that seems to be inherited.

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