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The jugal bone is located on either side of the skull in the circumorbital region. It is the origin of several masticatory muscles in the skull. [1] The jugal and lacrimal bones are the only two remaining from the ancestral circumorbital series: the prefrontal, postfrontal, postorbital, jugal, and lacrimal bones. [2]
Some industrially produced ready-made rabbit foods, especially pellets and muesli, are very low-fiber and therefore are known to be one of the main causes of molar spurs and secondary malocclusion if fed over an extended period of time [27]. Osteoporosis: Holes appear in the skull by X-Ray imaging. This reflects the general thinning of the bone ...
Rabbits are known to carry their ears in one of five ways: [2] Erect ears (the most common): Both ears are carried upright. Such ears may at times rest atop the rabbit's back, or be temporarily smoothed down by the rabbit when it bathes or grooms itself. Full lop ears (less common): Both ears hang fully down, brushing the rabbit's cheeks and ...
Rabbits and hares move by jumping, pushing off with their strong hind legs and using their forelimbs to soften the impact on landing. Pikas lack certain skeletal modifications present in leporids , such as a highly arched skull, an upright posture of the head, strong hind limbs and pelvic girdle, and long limbs. [ 19 ]
In rabbits, the dewlap is a secondary sex characteristic of female rabbits which grows once the doe reaches sexual maturity. In laboratory conditions, when a butyl alcohol extract of the urine of pregnant women was administered to male rabbits, they developed a dewlap, which then gradually disappeared once the administration ceased.
The squamosal is a skull bone found in most reptiles, amphibians, and birds. In fishes, it is also called the pterotic bone. [1] In most tetrapods, the squamosal and quadratojugal bones form the cheek series of the skull. [2] The bone forms an ancestral component of the dermal roof and is typically thin compared to other skull bones. [3]
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The skull proper was joined by the bones of the operculum. The skull itself was composed rather loosely, with a joint between the bones covering the brain and the snout. The skull roof in lungfish is composed of a number of bony plates that are not readily compared to those found in early amphibians. [4]