Related by context. Frequent words. (Click for all words.) 61 theropod 60 vertebrate 58 tyrannosaur 58 crocodilians 58 hominins 56 mammals 56 trilobites 56 tyrannosaurs 56 herbivorous 55 Tiktaalik 55 tetrapods 55 sticklebacks 55 baleen whales 54 Neandertals 54 carnivorous dinosaurs 54 Archaeopteryx 54 subfamily 54 phylum 54 marine reptiles 53 Longrich 53 theropods 53 forelimbs 53 evolutionarily 53 single celled 52 marine invertebrates 52 Homo sapiens 52 multicellular 52 multicellular organisms 52 hominin 51 Caenorhabditis elegans 51 diatoms 51 Archaea 51 Australopithecus 51 lineages 51 pterosaurs 51 Ardipithecus 51 clades 51 vertebrates 51 flagellum 51 sauropods 51 gobies 51 genus Homo 51 dinosaurs 50 pterosaur 50 Neandertal 50 taxa 50 single celled organisms 50 archaea 50 eukaryotes 50 pectoral fins 49 fossilized remains 49 Homo habilis 49 mammal 49 melanosomes 49 sauropod 49 asexual reproduction 49 hominids 49 Late Cretaceous 49 arthropods 49 megafauna 49 bipedalism 49 mitochondrial genome 49 sea anemones 49 Homo erectus 48 triceratops 48 hominid 48 plesiosaur 48 clade 48 hermaphrodites 48 cichlids 48 mammoths 48 Stegosaurus 48 phylogenetic 48 mandibles 48 canine teeth 48 diatom 48 morphology 48 squids 48 cephalopods 48 forelimb 48 palaeontologists 48 pterodactyls 48 hadrosaur 48 morphological 48 organisms 47 wooly mammoth 47 molluscs 47 morphologies 47 mammalian 47 saber toothed cats 47 copepods 47 Cretaceous Period 47 herbivores 47 dinos 47 fossils 47 herbivore 47 homo sapiens 47 phylogeny 47 Biology Letters 47 lampreys 47 coprolites