The colossal squid has never been seen alive; the sperm whale weighs 70 tons.
The American alligator uses its jaws to crush turtles; black bears are small but powerful.
The anaconda can exceed 30 feet long and 300 pounds, making it the world's largest snake; pound for pound, a jaguar is more muscular than a lion or tiger.
The gorilla possesses both physical strength and intelligence; the agile leopard is a well-designed predator.
The lion is born to hunt and fight; the Nile crocodile in an ambush predator with crushing teeth and a fierce bite.
The polar bear is the largest land-based carnivore; a walrus can weigh two tons.
Hippos are reported to kill more humans than any other mammal in Africa; bull sharks are blamed for more attacks on humans than any other species of shark.
In the wilderness of northeastern Russia, two top carnivores live and hunt side by side.
Experts reconstruct the predation techniques of the cougar and the wolf.
A zoologist and a veterinarian evaluate the powers of the elephant and the rhino.
Asiatic lions live in northern India, not far from the nearest tigers.
The largest reptile on the planet can meet the world's largest predatory shark off the shores of Australia.