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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]
Surface anatomy, or superficial anatomy, is the study of anatomical landmarks that can be identified readily from the contours or other reference points on the surface of the body. [1] It is important in human anatomy: with knowledge of superficial anatomy, physicians gauge the position and anatomy of deeper structures.
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]
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 ]
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles.
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 ...
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Coprophagy, the consumption of an organism's own fecal material to double the amount of time food spends in the digestive tract, is a common behaviour amongst rabbits and hares. This habit allows the animal to extract the maximum nourishment from its diet, and microbes present in the pellets also provide nutrients.