Ecology. Birds weigh risk before protecting their young.
Pennisi
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D000818:Animals; D001118:Argentina; D001130:Arizona; D001717:Birds / Q000502:physiology; D005260:Female; D008297:Male; D008425:Maternal Behavior; D009425:Nesting Behavior; D010332:Paternal Behavior; D011235:Predatory Behavior; D012098:Reproduction; D012306:Risk; D020308:Songbirds / Q000502:physiology