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lordosis behavior
Lordosis behavior, also known as mammalian lordosis (Greek lordōsis, from ''lordos'' "bent backward"〔(【引用サイトリンク】publisher=Wordnik )〕) or presenting, is a body posture adopted by some mammals including elephants, rodents, felines and others, usually associated with female receptivity to copulation. The primary characteristics of the behavior are a lowering of the forelimbs but with the rear limbs extended and hips raised, ventral arching of the spine and a raising, or sideward displacement, of the tail. During lordosis, the spine curves dorsoventrally so that its apex points towards the abdomen. In human physiology, the term "lordosis" is sometimes used to describe an abnormal forward curvature of the spine in the lumbar region.〔
==Description==
Lordosis is a reflex action that causes many non-primate female mammals to adopt a body position that is often crucial to reproductive behavior. The posture moves the pelvic tilt in an anterior direction, with the posterior pelvis rising up, the bottom angling backward and the front angling downward. Lordosis aids in copulation as it elevates the hips, thereby facilitating penetration by the penis. It is commonly seen in female mammals during estrus (being "in heat"). Lordosis occurs both during pre-copulatory behavior and during copulation itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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