To earn as many coins as possible in this game you’ll have to feed and raise very old animals, dinosaurs. Indeed, once the shell of the egg is broken, they will begin to howl. After all, they’re babies! To calm them, you’ll be able to give them milk to drink or a chicken to eat.
Then they’ll have to sleep with a mobile that will be placed over their nests. Beware, if you’re not going fast enough to take care of them, they may be removed before the end of their breeding and you’ll lose points.