As far as I know, dolphins have nipples in the anus (so the dolphins have such a specific mouthpiece, you have to get somehow). Since dolphins do not have a sucking reflex, the baby's nose irritates the mother's nipples and the baby releases milk.

Give yourself an interpretation!
The nipples of dolphins are not in the ass, but on the outside, on the sides of the so-called. genitourinary gaps, hidden in the skin folds, when the female does not feed and there is no milk, and they are completely cut off when there is a baby on feeding. Yes, milk is produced by the effort of the female, but the dolphin usually takes the nipple, the shape of the mouth does not interfere. By the way, a child eats very often and little by little, would have to turn such a procedure.
Damn, you have to "bushes in the ass... a roll there...". I wonder what wild dolphins say about people.