Sangheili

he Sangheili (Macto cognatus in Latin taxonomy, meaning "I glorify my kin") are a saurian sapient species known for their warrior culture and combat skill. Named after their home planet, Sanghelios, they have historically been known to humans as Elites for their former role in the Covenant's military hierarchy. Originally one of the Covenant's two founding species, the Sangheili formed the hegemony's military backbone until just before the end of its existence. They had a very strong rivalry with the Jiralhanae, which finally led to open conflict during the Great Schism at the conclusion of the Human-Covenant War.

Anatomy and Physiology
Sangheili are muscular and very tall, usually standing between 2.25 and 2.62 meters (7.38 and 8.6 feet).Their jaws are quadruple-hinged, with an upper jaw and four lower mandibles arranged in two tiers. Mandible and upper jaw structure along with teeth shape and numbers result from different phenotypes; however they do not indicate reproductive isolation.[ These mandibles have between six and twelve teeth each and some Sangheili have an additional, larger fang on the tips of each mandible. Anywhere from eight to more than a dozen broader teeth may be mounted on the upper jaw structure. Adult Sangheili mandibles can be found in varying shapes, sizes, and ranges of dexterity, and are as distinctive as a human fingerprint. Some Sangheili also possess molars. Sangheili smell with the use of two nostrils, each slightly in front of and below the eye socket. Sangheili' sense of smell is very developed.

Their hands are tetradactyl, each having two fingers in the middle and an opposing thumb on either side. Contrary to what their anatomy might suggest, Sangheili could release a loud, sharp and piercing whistle by placing their thumbs on the same hand into their mouths and blowing through the narrow gap. Their legs are digitigrade, with short upper and lower legs, and elongated tarsals, using the distal and intermediate phalanges to support their weight when walking. This arrangement possibly allows them to run very quickly and jump large distances, compared to ordinary humans and other Covenant races. Their superior agility may also be attributed to their homeworld's higher gravity; the additional strength required to move normally in a high-gravity environment would likely cause them to be more powerful in lower gravity situations. They also appear to have a double set of pectoral muscles, which contributes to their incredible strength. On the other hand, their digitigrade stance makes it difficult for them to climb vertical constructs such as ladders.

Sangheili have a binary circulatory system that pumps indigo-colored blood. They breathe oxygen and their homeworld has a nitrogen-oxygen atmosphere comparable to Earth's, allowing them to breathe the same atmosphere as humans. Sangheili cannot breathe molecular nitrogen.

Most Sangheili have leathery skin covered in many part by scales. Young Sangheili have pale protective scales hanging from their necks that they lose with age, an evolutionary leftover from the days when Sangheili parents used to carry their offspring in their jaws. Sangheili skin color can range from light brown to dark brown and from light gray to black. They have forward-facing eyes with vertical slits and horizontal eyelids much like those of terrestrial reptiles, likely giving them high-resolution central vision and depth perception. Sangheili are unable to perceive purple tones, which they see as blue. They are also able to see in the "infrabrown range". This apparently indicates that they lack L cone cells. Their eyes can have multiple colours ranging from red all the way to green and can be even gray. Most Sangheili though possess yellow or orange eyes.

Sangheili exhibit minor sexual dimorphism, with the females being slightly smaller than the males. Sangheili males possess a subtle leathery scent, while females have been described as smelling like "clean feathers". Sangheili are oviparous, meaning that they lay eggs rather than giving live birth. They incubate their recently hatched young in tank-like pods. The species is remarkably long-lived; Sangheili over 60 or 70 years of age have shown to be fully fit for combat duty.