Bison thunder across America's plains during the world's largest bison round-up in South Dakota, while bald eagles fly high at a Maryland dam during a feeding frenzy. Meanwhile, step back in time to America's last fully operational mule train, and then head to a quirky town in Alaska to meet the quirky mayor – a cat named Stubbs.

Come winter, manatees gather by the hundreds in Florida's coastal waterways, and monk parakeets native to South America hang out in a Brooklyn cemetery. Honeybees are dying off in droves, but President Obama is taking them in and taking up their cause. Donkeys worked as pack animals in the gold mines of the Wild West, but these days they're ruling the streets of an Arizona town.

Comeback kids are staking out new turf all over the United States of Animals. Up in Alaska, 100 wild wood bison fly to their new home in the middle of the wilderness. In North Carolina, folks lend their voices to endangered red wolves on a moonlit call and response howling. California condors feast on carrion, and tiny island foxes have reclaimed their territory in the Channel Islands.