back to search results
Share
twitterlinkedinfacebook
Image 63 of 413
< Prev Next >
BG383.jpg Male Blue Grouse displaying photo or image.
Blue Grouse (Dendragapus obscurus) male performing spring mating display (hooting).  Yellowstone National Park, Wyoming.  May.  Photo shows red air sac that inflates on sides of neck and makes low hooting sound.