animal dinosaur extinct herbivore herbivorous horns model plates quadruped reptile science Stegosaurus tail brood clutch eggs hatch hatchling nest Triceratops african coney dassies fur hyracoidean hyrax mammal relaxed relaxing rock-badgers rotund short-tailed soaking-up-the-sun sunning well-furred bark black coats black skin Bray common zebra equids fast grant’s zebra grazers herbivores herd herds individual patterns plains zebra social stripes ungulates unique white fur white stripes zebra black-rhinoceros collagen creases critically-endangered Diceros bicornis eating endangered folds food gray grazer grey heavy herbivorous-browser hide hook-lipped-rhinoceros keratin large lattice-structured megafauna odd-toed-ungulate offspring perissodactyl placid powerful rhino rhinoceros skin snout southern-white-rhinoceros square-lipped rhinoceros strong surface texture textures thick threatened tough wrinkled wrinkles zoo above water Ears eye head hippo hippopotamus hippopotamus amphibius light nostrils observant observing pool reflection reflections ripples rippling river horse semi-submerged shadows shiny submerged sunlight sunshine water wet black-&-white black-coats black-skin common-zebra grant’s-zebra greyscale monochrome plains-zebra striped white-fur white-stripes