Kitto's Popular Cyclopedia of Biblial Literature
Fig. 282—Gypaetos barbatus
Ossifrage, a bird of prey, which is supposed to be identical with the griffon of Cuvier, the Gypaëtos barbatus of nomenclators. The species in Europe is little if at all inferior in size to the Condor of South America, measuring from the point of the bill to the end of the tail four feet two or three inches, and sometimes ten feet in the expanse of wing; the head and neck are not, like those of vultures, naked, but covered with whitish narrow feathers; and there is a beard of bristly hair under the lower mandible: the rest of the plumage is nearly black and brown, with some whitish streaks on the shoulders, and an abundance of pale rust-color on the back of the neck, the thighs, vent, and legs; the toes are short and bluish, and the claws strong. In the young the head and neck are black, and the species or variety of Abyssinia appears to be rusty and yellowish on the neck and stomach.
Kitto, John, ed. Entry for 'Ossifrage'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/o/ossifrage.html.