The Amazon, the largest rainforest on Earth; drone footage captures giant otters hunting together while black caimans prey on newly hatched turtles; a harpy eagle chick's first days in the canopy and army ants on the move reveal new behaviors.

The Gulf Coast, where swamps and wetlands shelter black bears and alligators. Manatees gather in freshwater springs, burrowing owls look for love in the suburbs and a rare ocelot raises her kittens in Texas' thornscrub. With Tom Hanks.