Related by context. Frequent words. (Click for all words.) 63 chimpanzees gorillas 56 gorillas chimpanzees 55 frogs lizards 54 wolves coyotes 54 guanacos 54 Frans de Waal 54 amphibians reptiles 53 rheas 53 hoofed mammals 53 experimentally infected 52 eastern lowland gorillas 52 lowland gorillas 52 apes 52 primate cousins 52 pigs rabbits 52 lions cheetahs 52 chimpanzees 52 Richard Wrangham 52 monkeys apes 52 bonobos 51 penguins seals 51 bison elk 51 migrating northward 51 Nothing vulgar obscene 51 turtles frogs 51 SIV infected 51 coyotes foxes 51 kipunji 51 birds reptiles amphibians 51 chimps 51 By Laurie Kulikowski 51 Sumatran rhinoceros 51 canids 50 Indohyus 50 elk bison 50 simian immunodeficiency virus 50 Yankton Animal Shelter 50 Sumatran orangutan 50 capybaras 50 bonobo 50 nonhumans 50 insects reptiles 50 Sumatran orangutans 50 reptiles amphibians 50 lions tigers bears 49 komodo dragons 49 Grevy zebra 49 domesticated pigs 49 kinkajous 49 Australopithecus africanus 49 Amur leopards 49 Mycobacterium bovis 49 lizards snakes 49 anthropoids 49 anteaters 49 By BRIAN MCTAGGART 49 archeopteryx 49 sexually dimorphic 49 servals 49 tigers elephants 49 elephants giraffes 49 Neotropical 49 rabbits goats 49 snakes frogs 49 prematurely abort 49 Paranthropus 48 Galapagos tortoises 48 Kenya Malawi Mozambique 48 elephants rhinos 48 birds mammals reptiles 48 ground sloths 48 Madagascar Mali 48 By HARVEY SIMPSON 48 nonhuman primates 48 humans 48 bears mountain lions 48 Pergams 48 frogs toads 48 Darwin finches 48 Western lowland gorillas 48 tiger subspecies 48 Toxoplasmosis 48 SIV infection 48 monotremes 48 elephants tigers 48 Savage Rumbaugh 48 Evolutionary Anthropology 48 By HEIDI PRESCOTT 48 simian virus 48 By LOREN STEFFY 48 Species Found 48 functionally extinct 48 distinct subspecies 48 rabbits guinea pigs 47 hominid species 47 nonhuman animals 47 snakes lizards 47 lions leopards 47 Andean condor 47 host = document.location.host 47 peccary