Life
Scratching is contagious among strangers – if you are an orangutan
Orangutans scratch themselves when they see others do it Among orangutans, scratching is contagious – just as yawning is among humans. When an orangutan sees another scratch, they often start scratching themselves. However, the behaviour differs from contagious yawning in one crucial respect. Humans catch yawns more readily from close family and friends, but the …