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activity adaptive animal behavior annelid ants arthropods B.F. Skinner basic becomes bees behav behavior pattern behavioral development bird cells central nervous system cephalization changes chemical chick coelenterates colony comparative psychology complex compound eye concept crop milk detection developmental different levels effector effects eggs embryo environment environmental Euglena evolution evolutionary example experience experimental factors feeding behavior female fish flatworms function ganglia genetic hatching human individual innate insects instinctive interaction invertebrates investigators involved kineses learning level of integration levels of organization light low-intensity male mammals mating maturation mechanisms ment Morgan's Canon movements muscles nerve fibers neural neurons observations orientation peck phototaxis physiological primitive principle problem protozoans psychology receptor reflexes reproductive behavior response result sense organs sensitive sensory sensory systems social sow bug spawning species species-typical stage structure study of animal T. C. Schneirla threshold tion variability vertebrate visual Weber-Fechner Law worms York