Related by context. Frequent words. (Click for all words.) 59 mole rats 56 nocturnal creatures 56 hibernating 55 nocturnal animals 54 Dust mites 54 parasitic worms 54 Fruit flies 54 diurnal 54 woodchucks 53 defensins 53 quolls 53 humans 53 nematode worms 53 protozoan 53 mammals 53 hibernate 52 herbivores 52 stinkbugs 52 amoebas 52 unicellular 52 naked mole rats 52 platypuses 52 yellowjackets 52 cold blooded reptiles 52 fox squirrels 52 rodents 52 Salamanders 52 critters 52 circadian clocks 52 zooxanthellae 52 creatures 52 marine invertebrates 51 moray eels 51 methanogens 51 genetically programmed 51 Rodents 51 stoneflies 51 velociraptors 51 burrows 51 skunk cabbage 51 parasites 51 symbionts 51 herpes viruses 50 crocodilians 50 squirrels 50 salamanders 50 vertebrate animals 50 caterpillars 50 copepods 50 saber toothed tigers 50 Cyanobacteria 50 holly berries 50 planktonic 50 insects 50 copperheads 50 metabolically active 49 arthropods 49 apex predators 49 Toxoplasma 49 carpenter bees 49 metabolisms 49 nuthatches 49 temperate zones 49 Parasites 49 mammalian 49 moulting 49 Ostriches 49 Beluga whales 49 pileated woodpeckers 49 Migrating birds 49 snowshoe hares 49 mutant flies 48 sloths 48 mouthparts 48 cuckoos 48 kangaroo rats 48 taste receptors 48 prokaryotes 48 Mammals 48 hermaphrodites 48 colder climates 48 ungulates 48 gut microbes 48 Archaea 48 hibernation 48 aquatic insects 48 aquatic mammals 48 Octopuses 48 organisms 48 Klotho 48 crocodilian 48 phytoplankton blooms 48 backyard feeders 48 vertebrates 48 Midges 48 mycobacteria 48 toothed whales 48 fungi 48 stickleback 48 marine iguanas 48 baleen whales