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How one Western bird s numbers went from abundant to alarmingly low Benjamin Alva Polley/Field & Stream © Provided by Popular Science How one Western bird s numbers went from abundant to alarmingly low This story originally featured on Field & Stream. Each March, greater sage-grouse gather together at lek sites on their breeding grounds across the Great Basin. In groups of up to 50, the males strut their stuff in an ancient ritual display of stamina. Their tail feathers spike and fan out as they gulp in air, puffing up their white chest plumage and filling two yolk-like air sacs that rise with the inhale before their bodies drop and heads thrust forward with the exhale. The air sacs create a wup sound that can be heard two miles away, attracting females that spend up to three weeks selecting the male that shows it has what it takes.

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