The Atlantic Coast, where wild horses battle, bald eagles chase ospreys and sharks protect fish.

Mexico, where deserts meet tropics; see new footage of fledging pygmy owls, orca hunting and more.

The Wild West, where coyotes face a snowbound Yellowstone, bison battle on the plains and more.

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.