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This Concept Map, created with IHMC CmapTools, has information related to: Lee Lemmerman Hormones, Airborne Molecules that stimulate Reactions, Limited Resources as seen in House Sparrow, Unlimited Nesting Sites as seen in European Blackbird, Limited Resources as seen in European Starling, Low Testosterone Levels therefore Low Aggression, Unlimited Nesting Sites as seen in Song Sparrows, Low Testosterone Levels due to Excess, Each Egg-laying Period due to Intense Competition, First Brood due to Minimal Competition