Frog of the Week

Granular Poison Frog (Oophaga granulifera)

photo by Patrick Gijsbers

Common Name: Granular Poison Frog
Scientific Name: Oophaga granulifera
Family: Dendrobatidae – Poison Dart Frog family
Locations: Costa Rica and Panama
Size: .7 – .8 inches (18-22 mm)

The Granular Poison Frog is a diurnal (active during the day) species of frog. They are able to get away with being so visible to do their aposematic coloration that warn predators that they are poisonous. The males of the species are highly territorial in regards to their calling and breeding sites, even attacking other males. The frogs breed during the rainy season when the males will call out for the females. The females will then approach and the male leads her back to his breeding site. After breeding, the males will brood the eggs and keep them moist. After the eggs hatch, the females transport the tadpoles on their back to a water-filled plant. The females will then lay unfertilized eggs for the tadpoles to feed on. The genus Oophaga, which they are part of, translates to egg eaters due to this characteristic of their reproductive cycle.

The Granular Poison Frog is listed as Vulnerable by the International Union for the Conservation of Nature (IUCN) Red List due to habitat destruction and habitat fragmentation. They live in humid lowland forests that are threatened by logging, agriculture, and expanding urbanization. Better protections in these areas are needed to protect these species.

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