It is closely related to other members of the Ranidae family, which includes true frogs.
Here are some of its closest relatives:
* Other Bullfrogs: The American Bullfrog is part of the "Rana catesbeiana" species group, which includes other bullfrog species like the Taiwanese Bullfrog (Rana catesbeiana) and the African Bullfrog (Pyxicephalus adspersus).
* Green Frogs: The American Bullfrog is also closely related to green frogs, including the Green Frog (Rana clamitans) and the Pickerel Frog (Rana palustris).
* Leopard Frogs: There are also similarities between the American Bullfrog and Leopard Frogs, like the Northern Leopard Frog (Rana pipiens).
These close relatives share many physical and behavioral characteristics, and they are often found in similar habitats.