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A rook skull The rook is a very social bird; in the evenings they gather in large flocks, often in thousands. Rooks are highly gregarious birds and are generally seen in flocks of various sizes. Males and females pair-bond for life and pairs stay together within flocks.
The temporal fenestrae were much larger than those of their ancestors, and the widening of the zygomatic arch in a more mammal-like skull would have allowed for more robust jaw musculature. They also have the secondary palate that other primitive therapsids lacked, except the therocephalians , who were the closest relatives of cynodonts.
In Central and East Asia a common calendar system consists of a twelve-year cycle, with each year represented as an animal. The eleventh animal of the twelve-year cycle is the dog. Often such animals are depicted as human figures with an animal head. Thus, the cynocephalic depiction of the eleventh zodiac animal is common (possibly with a tail).
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 skulls of other vertebrates, it protects the brain from injury. [6] The skull consists of three parts, of different embryological origin—the neurocranium, the sutures, and the ...
The occipital bun pointed out on a Neanderthal skull. The occipital bun is a protuberance of the occipital bone. Its size and shape has been compared to that of a dinner roll. It is a quintessential trait of Neanderthals, though it is a trend in archaic Homo species. The true purpose of the occipital bun has not yet been defined. [3]
The scalp is the area of the head where head hair grows. [1] It is made up of skin, layers of connective and fibrous tissues, and the membrane of the skull. Anatomically, the scalp is part of the epicranium, a collection of structures covering the cranium. The scalp is bordered by the face at the front, and by the neck at the sides and back.
Neoteny in humans is further indicated by the limbs and body posture, with the limbs proportionately short compared to torso length; [2] longer leg than arm length; [6] the structure of the foot; [1] and the upright stance. [7] [8] Humans also retain a plasticity of behavior that is generally found among animals only in the young. The emphasis ...
The formation of goose bumps in humans under stress is a vestigial reflex; a possible function in the distant evolutionary ancestors of humanity was to raise the body's hair, making the ancestor appear larger and scaring off predators. [69] [68] Raising the hair is also used to trap an extra layer of air, keeping an animal warm. [68]