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The feathers on the head, neck and shoulders are particularly dense and silky. The legs and feet are generally black, the bill grey-black and the iris dark brown. In adults, a bare area of whitish skin in front of the eye and around the base of the bill is distinctive, and enables the rook to be distinguished from other members of the crow family.
Another unique trait is that their small milk teeth are lost before the animal is born. [citation needed] A few anatomical characters unite the Orycteropodidae and Tubulidentata. The occipital region of the skull has extensive mastoid exposure, the femur has a pectineal tubercle, and the diaphysis of the tibia is curved mediolaterally ...
Giraffe ossicones consist of a highly vascularized and innervated bone core covered with similarly vascularized and innervated skin. [1] They are attached to the skull with vascularized, innervated connective tissue. [1] Ossicones are formed at late gestation, but in early development they are not bony and not fused to the skull yet.
Skull in situ Human head skull from side Anatomy of a flat bone – the periosteum of the neurocranium is known as the pericranium Human skull from the front Side bones of skull. The human skull is the bone structure that forms the head in the human skeleton. It supports the structures of the face and forms a cavity for the brain. Like the ...
The word skin originally only referred to dressed and tanned animal hide and the usual word for human skin was hide. Skin is a borrowing from Old Norse skinn "animal hide, fur", ultimately from the Proto-Indo-European root *sek-, meaning "to cut" (probably a reference to the fact that in those times animal hide was commonly cut off to be used as garment).
[10] (p47) There is typically a septum made of bone or cartilage that separates the two nares, but in some families (including gulls, cranes, and New World vultures), the septum is missing. [ 10 ] (p47) While the nares are uncovered in most species, they are covered with feathers in a few groups of birds, including grouse and ptarmigans , crows ...
A 13,600-year-old mastodon skull was uncovered in an Iowa creek, state officials announced this week. Iowa's Office of the State Archaeologist said in a social media post that archaeologists found ...
In birds, it is an enlargement of the bones of the upper mandible or the skull, either on the front of the face, the top of the head, or both. The casque has been hypothesized to serve as a visual cue to a bird's sex, state of maturity, or social status; as reinforcement to the beak 's structure; or as a resonance chamber, enhancing calls. [ 4 ]