theropod, bipedalism, australopithecines, ichthyosaurs, hind limb, archaeopteryx, forelegs, pterosaurs, mandibles, crocodilians, smilodon, theropod dinosaur, psittacosaurus, thighbones, sauropods, plesiosaurs, mouthparts, chordates, eyespots, flagella, pelvic fin, pelvic girdle, protoceratops, scutes, premolars, somites, placentals, shoulder girdle, biped, tyrannosaur, tetrapod, braincase, dorsal fin, barbels, apatosaurus, gracile, monotremes, placoderms, musculature, oviducts, mammals, brachiosaurus, homo habilis, australopithecus, paranthropus, habilis, lordosis, hominids, snout, quadruped, rheas, australopithecus africanus, hominoid, vertebrates, sifaka, orangs, sea scorpion, ankylosaurus, flatfishes, setae, fossa, archosaur, peccary, locomotion, genus australopithecus, radula, featherless, serrations, crinoids, locomotor, plastron, pectoral fin, palps, springtails, clawlike, baleen whale, amphioxus, forewings, tubercles, canine tooth, iguanodon, tyrannosaurus, forepaws, pelvises, stegosaurs, erectus, binocular vision, femora, platypuses, genus homo, ostracods, rhomboids, utahraptor, subadult, subfamily, homo erectus, condyles, forefeet, appendages, baculum, coelophysis, bilaterally symmetrical, canines, forearms, flippers, legs, incisors, brain, cilia, thumbs, wings, biceps, femur, forearm, forelimb, humerus, intestine, pectoral, penis

bat, bird, bird-footed dinosaur, bird family, blower, cetacean, cetacean mammal, chiropteran, genus pygopus, homologize, hynerpeton bassetti, lesser anteater, mantid, mantis, mononychus olecranus, pectoral girdle, pygopus, sea cow, siren, sirenian, sirenian mammal, suborder theropoda, tamandu, tamandua, tamandua tetradactyla, theropod, theropoda, theropod dinosaur