Baby monkey crying very loudly and scared, why does the mother monkey treat like this on baby?

Pitiful, very sad to see baby monkey Leo with mom blocking milk #monkeys | Monkey Crying

I am Crying not stop and sorry for the baby monkey was in a serious accident. Poor monkey was injured until lost con-sciousness. #Monkeybibi

Clingy baby monkey won't leave man alone

Biting, clawing, attacking monkeys trying to snatch babies

Rescue baby monkey from trap and remove a lot of weaver ants in bamboo forest

Mom catch newborn &run away, Kidnapper try to catch her baby, The Monkey Camp 6855

Mom Rescue baby ALDO From Mud And Take A Bath