Animal Empires

The various methods of raising young, from large groups to single parents.

Just off the mouth of the Mississippi, a rare breed of Chinese deer has found a new home--and new hope--for its embattled species. Further east, the gopher tortoise, one of nature's expert diggers, recovers from catastrophic population decline brought on by human encroachment and habitat loss. Track the exciting efforts to revive some of the lesser-known animal empires.

Animals seek protection from threats in large numbers and remote areas.

Some animals use sheer numbers to infest areas and control new territory.

Many species migrate in massive numbers.

When domestic animals escape into the wild, some revert back to their origins and thrive. From wild donkeys in Bonaire to feral pigs in the Bahamas to the wild horses of Assateague, each has found success by reclaiming ancient codes of social living. But can their new environment sustain them forever?