Zebu Oil

Do animals give oil? I know it sounds crazy.. But like could they make something like it? There has to be something... In abut 40 years the oil will be gone, maybe we could get it from something form animals! (Without harming them.) Maybe in their (Ew.) waste. Maybe we can make something like it as humans. But for animals, I think be could get it from Bears or Deer or Zebu without killing them. It would be weird though, like deer oil! Or Zebu oil! (Anagram.) Sounds weird.