Related by context. Frequent words. (Click for all words.) 62 predator prey 57 Indohyus 55 ungulate 55 habituation 55 mating ritual 54 vertebrate 54 trophic 54 toothed whales 54 speciation 53 crocodilians 53 snowshoe hare 53 asexual reproduction 53 species 53 marine invertebrates 52 mammals 52 vertebrates 52 predation 52 humans 52 mammal 51 intertidal zone 51 mating rituals 51 habitat fragmentation 50 genetic variability 50 avian species 50 migratory patterns 50 foraging 50 evolutionarily 50 multicellular organisms 50 tetrapod 50 snowshoe hares 50 stickleback 50 symbionts 49 symbiotic relationships 49 biota 49 African savanna 49 platypuses 49 interspecies 49 herbivores 49 mutualism 49 keystone species 49 vocalisations 49 planktonic 48 sociality 48 terrestrial ecosystems 48 ptarmigan 48 mammalian brain 48 melanogaster 48 T. gondii 48 pronghorns 48 genetic diversity 48 narwhal 48 Wolbachia 48 evolutionary adaptation 48 cichlids 48 intertidal 48 mating 48 carnivores 48 bioaccumulation 48 sticklebacks 48 aquatic ecosystem 48 apex predators 48 microbiome 48 upland birds 48 Yellowstone ecosystem 47 phylogeny 47 habitat 47 courtship rituals 47 mammalian 47 baleen whales 47 Sperm whales 47 damselflies 47 Tiktaalik 47 herbivorous 47 skink 47 mammalian species 47 reproductive biology 47 olfaction 47 evolutionary 47 migratory 47 systematics 47 grassland habitat 47 morphological 47 furbearer 47 Mule deer 47 otoliths 47 nocturnal creatures 46 Argentine ants 46 upland bird 46 nocturnal animals 46 prokaryotes 46 biome 46 taxonomic 46 invertebrates 46 omnivores 46 arthropod 46 pinnipeds 46 diatom 46 theropod 46 grizzly bears 46 Biology Letters 46 palaeontology