Draco mindanensis of this species' patagium, or the extensible fold of skin used in flight, is red in males and dusky in females. Also, "D. mindanensis" can be distinguished from other species of "Draco" in the Philippines by its larger size (maximum length has been recorded at 105 mm), mode of five ribs supporting its patagium, upward directed nostril, lack of Y-shaped series of scales on forehead, presence of lacrimal bone and dorsal body coloration of pale brown with a slight greenish case in males. In males of this species, the dewlap, or the inflatable loose skin under the throat, is large,
Gular skin other prey while hunting. In cormorants, the gular skin is often colored, contrasting with the otherwise plain black or black-and-white appearance of the bird. This presumably serves some function in social signalling, since the colors become more pronounced in breeding adults. In frigatebirds, the gular skin (or gular sac or throat sac) is used dramatically. During courtship display, the male forces air into the sac, causing it to inflate over a period of 20 minutes into a startling huge red balloon. Because cormorants are closer relatives of gannets and anhingas (which have no prominent gular pouch) than of frigatebirds or