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Text and photos by Nick Baker, unless otherwise stated

 EcologyAsia 2008
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American Bullfrog
   

Adult in a small stream in secondary forest, Bukit Timah area, Singapore.


Juvenile group, Lower Peirce Reservoir, Singapore.

Family : RANIDAE
Species : Rana catesbeiana
Size (snout to vent) : 17 cm

References : H2

A native of the U.S. and southern Canada, this species has been freed into ponds and reservoirs in Singapore as a means of religious merit-making. This is potentially damaging to the amphibian diversity of Singapore's Central Catchment Area, as this large frog may well out-compete local species. 

Its size may reach 15 cm (snout-to-vent), and the colour is usually greenish-brown, with a green head. In females the tympanum (external ear drum) is of equal size to the eye, and in males much larger. The hind feet are well webbed

They feed on crustaceans, worms and insects and will also take other amphibians including their own kind. They are bred for food, as their hind legs are muscular and well suited as 'frogs-legs' for the local restaurant market.