Related by context. Frequent words. (Click for all words.) 63 Homo sapiens 63 humans 61 hominids 59 forelimbs 57 vertebrates 57 homo sapiens 57 ancestors 56 Homo erectus 56 hominid 56 mammals 56 tyrannosaur 55 nonhuman primates 55 ancestor 55 tetrapods 55 creatures 54 Australopithecus 54 Neandertals 54 chimpanzees 54 tyrannosaurs 54 hunter gatherers 54 dinosaurs 53 evolutionary 53 woolly mammoths 53 apes 53 Homo habilis 53 vertebrate 53 herbivores 53 chimps 53 primates 52 bonobos 52 multicellular 52 mammoths 52 theropods 52 African savannah 52 velociraptor 52 mammalian 51 single celled organisms 51 megafauna 51 Neanderthals 51 Humans 51 neural circuitry 51 Archaeopteryx 51 herbivorous 50 vertebrate species 50 evolutionarily 50 mammal 50 primate species 50 neurones 50 creature 50 forebears 50 marsupials 50 thylacine 50 domesticated 50 herbivore 50 dinos 50 domestication 50 arthropod 49 arthropods 49 Chimpanzees 49 phylogeny 49 primate 49 rhesus monkeys 49 lineages 49 T. rex 49 hind limbs 49 beings 49 hunter gatherer 49 triceratops 49 mutant mice 49 Tiktaalik 49 intelligent beings 49 anatomically modern 49 monkeys 49 common ancestor 48 phenotype 48 giant tortoises 48 phylogenetic 48 progenitors 48 species 48 littermates 48 melanosomes 48 prehistory 48 lizards 48 Velociraptor 48 echolocation 48 sauropods 48 mandibles 48 mammalian species 48 rodents 48 bipedal 48 pterosaurs 48 parasitic worms 48 Neanderthal 48 Cretaceous Period 48 evolutionary biologists 47 mice 47 lemurs 47 biped 47 insects 47 canine teeth 47 lifeforms