### Identification The American Bullfrog is the undisputed heavyweight of North American amphibians, with adults reaching a robust 8 inches in length. Look for a powerful, olive-to-brown body often mottled with darker grey spots. The critical field mark is the dorsolateral fold: unlike the similar Green Frog (*L. clamitans*), whose ridges run straight down the back, the Bullfrog’s ridge curves sharply behind the eye and wraps tightly around the massive eardrum (tympanum). To tell the sexes apart, look at that tympanum—in males, it is significantly larger than the eye; in females, they are roughly equal in size.
### Habitat & Range Native to eastern North America but now established globally as a successful (and often invasive) species, these frogs demand permanent water. You’ll find them in lakes, sluggish rivers, and deep ponds—habitats that don't dry up, as their massive tadpoles often require two full years to metamorphose. They favor shorelines choked with cattails and lily pads, which provide essential ambush cover.
### Behaviour During summer nights, the air vibrates with the male’s resonant, bass-heavy "jug-o-rum" call. Bullfrogs are highly territorial and surprisingly aggressive; you may witness "sumo-style" wrestling matches where males grapple to defend prime calling stations. When startled from the bank, they often emit a high-pitched "squeak" as they leap toward the safety of deep water.
### Diet The Bullfrog is a "gape-limited" predator: if it can fit in their cavernous mouth, it’s dinner. Using a lightning-fast, sticky tongue, they snatch up insects, crayfish, other frogs, rodents, and even small birds or bats.
### Fascinating Fact Bullfrogs are among the few animals that may never truly sleep. Research suggests that even during periods of "rest," they remain fully alert and responsive to painful stimuli and predators, never entering the state of unconsciousness we typically associate with slumber.