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This Concept Map, created with IHMC CmapTools, has information related to: Gibbs alone Hormones, anxiety in social contexts, breeding stage as seen in free-living male house sparrows, Hormones such as testosterone, a member of the same species as seen in anxiety, airborne molecules which can elicit a reaction, Hormones have stimulatory effects, environmental stimuli such as day length, elicit a reaction in a member of the same species, a member of the same species as seen in mating compatibility, environmental stimuli which have stimulatory effects, secondary sex characteristics used in aggressive displays, August/September to levels of 1 ng/ml, stimulatory effects on aggression, April - July during breeding stage, the anterior pituitary glands in response to environmental stimuli, sexual displays in reproductive contexts, testosterone vary according to seasonal changes, 1 ng/ml during postbreeding stage, environmental stimuli such as presence of mate, environmental stimuli such as nest sites