After Diego tells Sid that Manny and Ellie don't want them any more, Sid finds three abandoned eggs under the ice, which he takes up and names Eggbert, Shelly and Yoko. He also draws faces on them. Manny then tells him to take them back, but he doesn't, and next morning, they hatch into baby dinos.
See Baby Dinos for more information.
Play Sid's Egg Decorator and put your own designs on the eggs.