Related by context. Frequent words. (Click for all words.) 68 mammals 62 vertebrate 62 vertebrates 62 arthropods 61 mammal 61 herbivores 60 forelimbs 60 sauropods 60 carnivorous dinosaurs 59 herbivorous 59 theropods 58 Archaeopteryx 57 reptiles 57 pterosaurs 57 tyrannosaurs 56 tetrapods 56 species 56 tyrannosaur 56 baleen whales 56 Tiktaalik 56 herbivore 55 lizards 55 sauropod 55 multicellular organisms 55 alligators 55 Ardipithecus 55 arthropod 55 hominins 54 marsupials 54 copepods 54 hind limbs 54 mammalian 53 single celled organisms 53 primate species 53 carnivores 53 salamanders 53 crocodiles 53 taxa 53 nonhuman primates 53 multicellular 52 mammalian species 52 flightless birds 52 evolutionarily 52 river otter 52 Tyrannosaurus 52 pterosaur 52 sea anemones 52 amphibians 52 giant tortoises 52 damselflies 52 asexual reproduction 52 T. rex 52 cephalopods 52 avian species 52 copperheads 52 gobies 52 ungulates 52 cichlids 51 zooplankton 51 ant species 51 Homo erectus 51 lemurs 51 Australopithecus 51 invertebrates 51 dinosaurs 51 locomotion 51 lineages 51 filter feeders 51 trilobites 51 reptile 51 organisms 50 flagella 50 upright posture 50 opossums 50 mandibles 50 Archaea 50 humans 50 skinks 50 hominids 50 genetic variability 50 genus Homo 50 creatures 50 Late Cretaceous 50 lungfish 50 narwhal 50 naked mole rats 50 aquatic insects 50 cetaceans 50 millipedes 50 lemur 50 hoofed animals 50 megafauna 50 hominid 50 nestlings 50 petrels 49 seahorses 49 pronghorns 49 vertebrate species 49 diatoms 49 lampreys 49 diatom