How do you regurgitate?

To remove the contents of their stomachs. Mostly because they are overfull. Babies will eat until they are overflowing. Try burping them to make more room in their bellies.

Some cuckoos do not raise their young, they leave their eggs in the in the nest of other birds so they raise them, these types are known as parasitic cuckoos. However those that raise their own...

Birds regurgitate by swallowing their food and turning it into goo in their stomach.(Kids,do not try this at home!) Than afterward the mother bird returns to the nest and throws up in the babies...

Cows are designed to eat as much food as they can than latter slowly chew and digest their food. In the wild they never knew when predators where going to attack, so they would eat and eat filling...

Normally, a hog does not regurgitate. If the pig is ill, one of the symptoms may be throwing up.