American bullfrog – Lithobates catesbeianus
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Description
American bullfrog is a large North American, edible frog species. Preferred habitats include shallow and permanent or slow-flowing waters. American bullfrogs are opportunistic feeders and feed on a wide variety of other frogs, reptiles, small mammals, and even birds and bats. Even the tadpoles enjoy a diverse diet, feeding not only on algae but also the eggs and larvae of many aquatic animals. Bullfrogs reproduce efficiently. In the spring, the spawning season is initiated by males finding a territory to defend, in which the female lays thousands (up to 40,000) eggs. In the southern part of the range, tadpoles take a few months to metamorphose, but up to three years in the northern parts.
Natural enemies of American bullfrogs include big herons, alligators, snakes and some predatory fish. Even salamanders and smaller fish feed on the larvae and eggs. American bullfrogs have been found to be partially resistant to the venom of certain snake species which prey on them.
American bullfrogs are also caught for human consumption. The traditional way of hunting them is to paddle or pole silently in shallow water and, when the frog's call is heard, a bright light is shone at the frog, which temporarily inhibits its movement. Then the frog is gigged with a multiple-tined spear and brought into the boat. The only parts normally eaten are the rear legs, which resemble small chicken drumsticks.
The map represents observations of this taxon, but it may not be used as a distribution map.
- Total squares
- härkäsammakko (Finnish)
- oxgroda (Swedish)
- American bullfrog (English)
Establishment | Does not occur in Finland |
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Invasive alien species of Union concern (EU 2016/1141; 2017/1263; 2019/1262; 2022/1203) ?
- Hanna Laakkonen
- Reptiles and amphibians
- Amphibians