Bullfrogs (Rana catesbeiana) are native to all of New England except Northern Maine and introduced becoming established west of the Rockies. Habitat: Marshes, ponds, slow rivers. Bullfrogs are large, aggressive predators and are prolific breeders that have seriously depleted native frog populations in many western areas and are the largest frog in New England. The American Toads (Bufo americanus) also love to visit ponds in late spring and early summer to lay eggs. They are the first of the frogs and toads to breed in ponds, along with the spring peepers. Their eggs are attached in long strings around plants which hatch in 4-11 days or so. Like their parents, the tadpoles are distasteful and perhaps poisonous but a few animals will eat toads and tadpoles. After about two months (depending on the temperature), the toads change to adults and leave. Ludlow, MA. USA. Summer. Wild