Charles Hall, retired U.S.A.F. officer who supposedly spoke with the "Tall Whites", an extraterrestrial species who has been visiting earth for many thousands of years, when they were living in the underground mountains of Area 53 in 1965-1967 (when he was working with them), said this in his book that he wrote about his interactions:
"There are quite a few. However, humans are the only people that we have seen who live so closely with their animals. For example, you feel comfortable milking cows, riding horses, and playing with dogs. Every one of those animals could kill you, but you naturally use your intelligence to determine how each of those animals is thinking. Then you naturally take control of them. Only humans do that. On most planets, once people become intelligent, they don't want to have anything to do with the animals that are much less intelligent then they are, so they kill them off. Also, humans will eat almost anything. On all of the other planets, the intelligent people will only eat plants. We, for example, only eat plants."