Related by context. Frequent words. (Click for all words.) 62 gorillas chimpanzees 58 homo erectus 58 Indohyus 57 horned dinosaurs 57 monotremes 57 chimpanzees gorillas 56 Frans de Waal 56 apelike 56 australopithecines 56 apes 56 kipunji 56 coevolution 56 placental mammals 56 H. erectus 56 hominid species 55 saber tooth tigers 55 Paranthropus 55 nonhuman primate 55 mosasaurs 55 Darwin finches 55 hominins 54 chimpanzees 54 allosaurus 54 sexual dimorphism 54 peccary 54 Ventastega 54 H. sapiens 54 humans 54 anthropoids 53 evolutionarily 53 simian immunodeficiency virus 53 Scientists theorize 53 African savanna 53 aurochs 53 Toumai 53 theropod dinosaurs 53 chimps 53 reproduce asexually 53 forelimbs 53 bipedalism 52 monkeys apes 52 Homo sapiens 52 Neandertals 52 platypuses 52 Microraptor 52 auklets 52 genus Homo 52 domesticated cats 52 vertebrate animals 51 nonhuman primates 51 frogs salamanders 51 echidnas 51 afarensis 51 carnivorous dinosaurs 51 fruitflies 51 elephants rhinos 51 theropod 51 peccaries 51 springtails 51 Homo Erectus 51 translocate 51 biogeographic 51 A. afarensis 51 Ardipithecus ramidus 51 ichthyosaur 51 Richard Wrangham 51 Pruetz 50 eukaryote 50 Ardipithecus 50 hunter gatherer societies 50 primates 50 H. floresiensis 50 anatomically modern 50 tyrannosaurus 50 amphibians reptiles 50 ape 50 Bornean 50 parasitize 50 hominid 50 braincase 50 gut microbiota 50 tigers leopards 50 banteng 50 ground sloths 50 feathered dinosaurs 50 primitive organisms 50 elk bison 50 velociraptors 50 Australopithecus 50 crurotarsans 50 Torosaurus 50 pinniped 50 gemsbok 49 anteaters 49 Sociobiology 49 capybaras 49 mammalian species 49 giant tortoise 49 tetrapod 49 biped 49 crocodilian