Do a warthog's looks serve a purpose?

By analyzing the chemical "fingerprint" of rhino horns, scientists help in the fight against poaching.

All five of the world's diverse species of rhinoceros have been brought to the edge of extinction because of human appetite for their distinctive horns.

Blue wildebeest females and their young form herds of anywhere from 10 to 1,000 individuals. Young males form bachelor groups, but most adult males are solitary.