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The Shetland is a small, wool-producing breed of sheep originating in the Shetland Isles, Scotland, but is now also kept in many other parts of the world. It is part of the Northern European short-tailed sheep group, and it is closely related to the extinct Scottish Dunface .
Cephalization is a characteristic feature of the bilaterians, a large group containing the majority of animal phyla. [3] These have the ability to move, using muscles, and a body plan with a front end that encounters stimuli first as the animal moves forwards, and accordingly has evolved to contain many of the body's sense organs, able to detect light, chemicals, and gravity.
The meat and milk of the breed are proven through a range of studies to contain far more minerals and healthy fatty acids and far less unhealthy trans fatty acids than conventional modern breeds. [18] [19] [20] Efforts to restore the Shetland breed continue. The Shetland Cattle Herd Book Society continues to protect the breed.
Evisceration is a method of autotomy involving the ejection of internal organs used by animals as a defensive strategy. Sea cucumbers (Holothuroidea) eject parts of the gut in order to scare and defend against potential predators such as crabs and fish. The organs are regenerated in a few days by cells in the interior of the sea cucumber. [1] [2]
The Shetland Pony is a very small, robust breed of pony. Shetlands range in size from about 710 to 1070 mm, with an official maximum height at the withers (1200 mm for American Shetlands). Shetland Ponies have heavy coats and short legs, and are considered quite intelligent. They are a very strong breed, used for riding, driving, and pack purposes.
Cecotropes (also caecotropes, cecotrophs, cecal pellets, soft feces, or night feces) are a nutrient filled package created in the gastointestinal (GI) tract, expelled and eaten by rabbits and guinea pigs (among other animals) to get more nutrition out of their food. The first time through the GI tract, small particles of fiber are moved into ...
Discarded exoskeleton of dragonfly nymph Exoskeleton of cicada attached to a Tridax procumbens (colloquially known as the tridax daisy)An exoskeleton (from Greek έξω éxō "outer" [1] and σκελετός skeletós "skeleton" [2] [3]) is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the internal organs ...
A true endoskeleton is derived from mesodermal tissue. In three phyla of animals, Chordata, Echinodermata and Porifera (), endoskeletons of various complexity are found.An endoskeleton may function purely for structural support (as in the case of Porifera), but often also serves as an attachment site for muscles and a mechanism for transmitting muscular forces as in chordates and echinoderms ...