Related by context. Frequent words. (Click for all words.) 53 sociality 51 mating rituals 50 nematode worms 50 hermaphroditic 49 gut microbes 49 neurochemistry 49 asexual reproduction 49 reproduce asexually 49 T. gondii 49 nonhuman primates 48 humans 48 vocalisations 48 interspecies 48 evolutionary origins 48 sexual dimorphism 48 Drosophila melanogaster 48 reproductively 48 Fruit flies 48 gamete 48 zebra finch 47 reproductive hormones 47 morphologically 47 melanogaster 47 vertebrate animals 47 zygotes 47 mammalian species 47 Toxoplasma 46 germline 46 hermaphrodites 46 Frans de Waal 46 genetically engineered mouse 46 transgenes 46 behavioral traits 46 Wolbachia 45 monogamous 45 chromosomal regions 45 mutant genes 45 mating habits 45 single celled organisms 45 neural cells 45 rhesus macaques 45 genetically programmed 44 herpes viruses 44 heritable 44 prokaryotes 44 Caenorhabditis elegans 44 evolutionarily 44 fruit fly Drosophila 44 amino acid sequences 44 pipefish 44 genes 44 heterosexual males 44 copulation 44 evolutionary adaptation 44 female reproductive tract 44 cholesterol metabolism 43 phylogenetic analysis 43 behaviors 43 gene expression patterns 43 genetically 43 courtship ritual 43 mammalian 43 neurones 43 roundworms 43 histone modifications 43 microbiome 43 zebra finches 43 monogamous relationships 43 dopamine receptors 43 rhesus 43 oocyte 43 genetic mutations 43 multicellular organisms 43 motile 43 rhesus monkey 43 nonhuman animals 43 experiments 43 vitro experiments 43 courtship rituals 43 homologs 43 phenotyping 43 cell signaling pathways 43 marine invertebrates 43 autistic traits 42 evolutionary psychologists 42 vertebrate 42 cellular pathways 42 olfactory receptors 42 predisposing 42 neural circuitry 42 copulate 42 prosocial 42 circadian clocks 42 metabolisms 42 developmental abnormalities 42 poxvirus 42 reproductive biology 42 gonad 42 rhesus monkeys 42 rhesus macaque monkeys 42 antisocial behaviors