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activity adaptive adult n.a. females aggressive androgen animal behavior appetitive behavior areas attack bees behavior patterns birds brain bumblebees cage castrated CD-I changes chicks classical conditioning comparative psychology correlations corticosterone critical period dance days of age effects electric electroreceptors elicited energy estradiol ethologists ethology evolution evolutionary example experimental experiments factors feeding fish fixed action pattern forager station frequency function gene genetic gland gulls havior hormone hypothalamus implants infants injections kittens laboratory latency learning Lorenz mammals mating mechanisms ment monkeys mother moths nervous system nest neural observed occur organization organizational processes performance phylogenetic Physiol physiological predator present Press primates progesterone prolactin Psychol puppies rats recruits response Science selection sexual behavior similar social song species stimulation strains testosterone testosterone propionate theory Tinbergen tion toads treatment tympanic nerve visual weeks York young