Alligators inhabit in Florida and Louisiana's rivers, swamps, and marshes. Webbed feet and strong tails drive these outstanding swimmers. They're 10 to 15 feet long.
Alligators
Blue crabs are abundant in the Hudson River as well as the Chesapeake Bay. They're omnivorous and have a cool protection mechanism against predators.
Chesapeake Bay
Freshwater eels are slim, olive-green to brown, and snakelike. Females reach 3 feet, males 1.5 feet. These eels swim from the Gulf to Minnesota up the Mississippi.
Freshwater Eels
Tan creatures with brown and olive stripes. They like steady flow and coarse rock, such in Missouri's Meramec River. Daytime-hunting crayfish hiding.
Belted Crayfish
North America's largest catfish is blue. The barbels on their chin give these fish their names. Their taste buds help them discover food in dark seas despite limited eyesight.
Blue Catfish
The common otter lives in river-accessible burrows and is semiaquatic. Aquatic otters play and eat. Their breath hold is 8 minutes and 330 feet.
Common Otter
Female river frogs deposit eggs in vegetation-rich water environments. They're common in Florida, Mississippi, and southern North Carolina. They have blackish-green skin with grey markings.
Frogs
The diving bell spider lives fully underwater. They survive underwater by submerging and securing a bubble of air with silk. In air bubbles, they feed, relax, and reproduce.