Crotalus oreganus helleri: Southern Pacific Rattlesnake

• Dingo
• Jackal
• Animal Diversity Web - Canis simensis
• ARKive - Ethiopian Wolf (Canis simensis)
• National Library of Medicine - Molecular Genetics of the Most Endangered Canid
• Smith College - Mammalian Species: Canis simensis
• Animal Info - Ethiopian Wolf
• Wolf Science Center
• Gray Wolf
• Canis lupus famliliaris
• Wolves of the World
• Mexican Gray Wolf