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The enteric nervous system (ENS) is that part of the peripheral nervous system of vertebrates that plays a fundamental role in control of the gastrointestinal system. It is responsible for the behavior of the bowel, as well as regulating intestinal blood supply and other digestive functions. The enteric nervous system is very complex and has many more neurons than the spinal cord. This system is capable of autonomous functions, acting independent of conscious control, such as the coordination of reflexes. It also receives considerable innervation from the autonomic nervous system. Thus, it generally is considered a part of the autonomic nervous system, which is one of the two main divisions of the peripheral nervous system.

Owl is the common name for any of the birds of prey comprising the order Strigiformes, characterized by large, round, frontset eyes surrounded by a circular or heart-shaped disk of radiating feathers, sharply hooked beaks, feathered and hooked talons, ears that can be closed, a relatively large head, and often a soft and fluffy plumage with serrated edges that allows for flight that is almost noiseless. Most are solitary, and nocturnal, with some exceptions (for example, the burrowing owl). There are over 200 extant species divided into two families, the typical owls, Strigidae, and the barn-owls, Tytonidae. They are found in all regions of the Earth except Antarctica, most of Greenland, and some remote islands.