A male Great Frigatebird (Fregata minor) performs a courtship display with an inflated gular sac. Midway Atoll National Wildlife Refuge.

Filename: DAH_090327_31901.jpg
Copyright: © David Andrew Hartley. All Rights Reserved.
Image Size: 4256x2832 / 8.0MB; www.davehartleyphoto.com; Adult Bird Color Image Courtship David Andrew Hartley Day Display Eastern Island Fregata minor palmerstoni Front View Great Frigatebird Horizontal Inflated Gular Sac Male Midway Atoll Midway Atoll National Wildlife Refuge National Wildlife Refuge Nobody One Animal Outdoors Pouch Red Remote Wildlife