hidden food and in completing a learned task than wolves were. The most prominent observation these researchers made was that the dogs would look into the eyes of the human as if looking for a clue and the wolves would not look at the faces of the humans. They concluded that this is a genetic difference between the two species as a result of evolution.

Monkeys

Monkeys are often studied because of the close evolutionary relationship between monkeys and humans. Like humans, some monkeys tend to show declining social activity with

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