A male Centrocercus urophasianus (greater sage-grouse) at dawn trying to attract a female at a mating lek. They are known for filling giant air sacks in their chests and letting out a low thumping noise. They also strut around while doing the thumping call / display. It's kind of cute, in a strange way. They are extremely sensitive birds and you can't get very close without spooking them. This photo is cropped way in.

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