The American Bullfrog is the largest native frog species in North America, reaching up to 20 cm in body length and weighing over 500 grams. It has a robust body, smooth skin with shades of olive-green to brown, often with darker mottling, and a pale underside. The tympanum (external eardrum) is large and distinct, especially in males, where it is noticeably larger than the eye. Males also have a yellowish throat during the breeding season. This species is known for its deep, resonant call that resembles the low bellow of a bull, giving rise to its common name.
TADPOLE are among the largest of any frog species, sometimes exceeding 15 cm in length. They have olive-green to brown bodies with small dark spots and a pale belly. Tadpoles may remain in the larval stage for one to two years before metamorphosis, depending on environmental conditions.
Aggressive or Danger to Human? This species is not dangerous to humans and lacks venom or harmful secretions. However, it can be highly aggressive toward other aquatic animals, preying on insects, fish, small frogs, snakes, birds, and even small mammals. Its strong predatory nature makes it an ecological threat in regions where it has been introduced.
Population Status: Least Concern (LC) globally (Source: IUCN Red List).
Habitat and Habits: American Bullfrogs inhabit a wide range of freshwater environments including ponds, lakes, marshes, slow-moving streams, and reservoirs. They prefer warm, permanent bodies of water with abundant vegetation. The species is highly adaptable and has been introduced to many parts of the world, often outcompeting native amphibians. Bullfrogs are primarily nocturnal and are powerful jumpers and swimmers. Breeding occurs in late spring to summer, with females laying up to 20,000 eggs in large floating masses. Both adults and tadpoles rely on aquatic habitats for most of their life cycle.