Related by context. Frequent words. (Click for all words.) 61 vocalisations 59 sensory organs 58 olfaction 57 pheromones 56 visual stimuli 56 external stimuli 56 neural circuitry 56 sensory stimuli 56 odorants 55 visual cues 55 sensory input 55 neural circuits 54 circadian clocks 54 sociality 54 neuronal activity 54 olfactory senses 53 iridescence 53 courtship rituals 53 neurochemical 53 olfactory 53 neural mechanisms 53 physiological 53 sensory neurons 53 zebra finches 53 sensory inputs 53 auditory 52 brain circuitry 52 physiological responses 52 mating 52 neurones 52 anthropomorphizing 52 vocalization 51 echolocation 51 hermaphroditic 51 behavioral patterns 51 genetically programmed 51 Pheromones 51 mirror neurons 51 female reproductive tract 51 neural pathways 51 spatial orientation 51 synchrony 51 vocalizations 50 Drosophila melanogaster 50 olfactory bulb 50 relatedness 50 habituation 50 neurochemicals 50 humans 50 morphological 50 sensory 50 rhodopsin 50 sticklebacks 50 neural 50 exquisitely sensitive 50 oscillatory 50 synaesthesia 50 evolutionarily 50 vaginal secretions 49 phenotypes 49 reproductive hormones 49 nonhuman animals 49 motile 49 morphologically 49 prosody 49 nematode worms 49 gut microbes 49 mammalian brain 49 germ cells 49 limbic 49 chemotaxis 49 neurophysiological 49 sensory nerves 49 neurochemistry 48 researchers hypothesized 48 hermaphrodites 48 visual stimulation 48 pheromone 48 evolutionary adaptation 48 physiological mechanisms 48 nonverbal cues 48 visual cortex 48 corticosterone 48 spatial reasoning 48 behavioral traits 48 developmental abnormalities 48 sensory stimulation 48 cognition 48 asexual reproduction 48 cognitions 48 stimuli 48 photoreceptors 48 biochemical pathways 47 colouration 47 reproductively 47 oviduct 47 locomotor 47 Nerve cells 47 biological molecules 47 chloroplast 47 gut flora