The birth of two jaguar cubs at the Milwaukee County Zoo in November is a big deal because their father was born in the wild, a rarity for zoos' reproductive programs. The new genes "will help sustain the population over the next 100 years," says Stacey Johnson of the American Zoo and Aquarium Association. (Milwaukee County Zoo via Associated Press)

The birth of two jaguar cubs at the Milwaukee County Zoo in November is a big deal because their father was born in the wild, a rarity for zoos' reproductive programs. The new genes "will help sustain the population over the next 100 years," says Stacey Johnson of the American Zoo and Aquarium Association. (Milwaukee County Zoo via Associated Press)