The Matilda's horned viper, discovered in southwestern Tanzania about two years ago, is the world's newest snake species. It's named for the daughter of one of its discoverers, the director of the Wildlife Conservation Society in Tanzania. (Associated Press)

The Matilda's horned viper, discovered in southwestern Tanzania about two years ago, is the world's newest snake species. It's named for the daughter of one of its discoverers, the director of the Wildlife Conservation Society in Tanzania. (Associated Press)