In the Dino Run game, there are large dinos that can help or hinder your progress in a level. Some of them can be
Alien spaceship

Large Dinosaurs in the Alien Spaceship

killed when you have a strength boost active. Except for the Diplodocus, Brachiosaurus, and burning Dactyl all of them appear in the UFO at the end of Beyond Apocalypse with a another one (presumably a mate) and two children.