The rump or croup, in the external morphology of an animal, is the portion of the posterior dorsum – that is, posterior to the loins and anterior to the

tail The tail is the section at the rear end of certain kinds of animals’ bodies; in general, the term refers to a distinct, flexible appendage to the torso. It is the part of the body that corresponds roughly to the sacrum and coccyx in mammal ...

. Anatomically, the rump corresponds to the sacrum. The tailhead or dock is the beginning of the tail, where the tail joins the rump. It is known also as the base or root of the tail, and corresponds to the human sacrococcygeal symphysis. In some

mammal Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur ...

s the tail may be said to consist of the tailbone (meaning the bony column, muscles, and skin) and the skirt (meaning the long hairs growing from the tailbone). In birds, similarly, the tail consists of tailbone and tailfan (tail fan). Some animals are subjected to docking, the

amputation Amputation is the removal of a limb by trauma, medical illness, or surgery. As a surgical measure, it is used to control pain or a disease process in the affected limb, such as malignancy or gangrene. In some cases, it is carried out on indi ...

of the tailbone at or near the dock. These include dogs, cats,

sheep Sheep or domestic sheep (''Ovis aries'') are domesticated, ruminant mammals typically kept as livestock. Although the term ''sheep'' can apply to other species in the genus '' Ovis'', in everyday usage it almost always refers to domesticate ...

, pigs, and

horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million yea ...

s. Humans have a remnant tail, the coccyx, and the human equivalent of docking is coccygectomy.

Usage

Usage varies from animal to animal.

Bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...

s and

cattle Cattle (''Bos taurus'') are large, domesticated, cloven-hooved, herbivores. They are a prominent modern member of the subfamily Bovinae and the most widespread species of the genus '' Bos''. Adult females are referred to as cows and adult ...

are said to have a rump and tailhead. Dogs are said to have a rump and dock.

Horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million yea ...

s are said to have a croup"How do I...Identify Parts of the Horse" ''Arabian Horse Association''
croup) (sometimes rump), thigh or haunch, buttock, and dock.

Birds

In bird anatomy, the rump is the body immediately above the tail. The color of plumage on the rump is a characteristic widely used by

ornithologist Ornithology is a branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them." Several aspects of ornithology differ from related disciplines, due partly to the high visibility and th ...

s to distinguish between related species, and sometimes also between males and females of the same species. Similarly, the silhouette of the tailfan is a characteristic widely used for purposes of identification, particularly in the field. Some birds have a food reservoir pouch in the

esophagus The esophagus (American English) or oesophagus (British English; both ), non-technically known also as the food pipe or gullet, is an organ in vertebrates through which food passes, aided by peristaltic contractions, from the pharynx to t ...

that is known as a

croup Croup, also known as laryngotracheobronchitis, is a type of respiratory infection that is usually caused by a virus. The infection leads to swelling inside the trachea, which interferes with normal breathing and produces the classic symptoms ...

(or crop), which should not be confused with the croup (rump) of a horse.

Dogs

In some breeds it is traditional for tails to be cut off ( docked) at the dock.

Horses

horse anatomy Equine anatomy encompasses the gross and microscopic anatomy of horses, ponies and other equids, including donkeys, mules and zebras. While all anatomical features of equids are described in the same terms as for other animals by the Internation ...

, the croup refers specifically to the topline of the horse's hindquarters and surrounding musculature, beginning at the hip, extending proximate to the sacral vertebrae and stopping at the dock of the

(where the coccygeal vertebrae begin). Below the croup is the thigh or haunch. Behind the thigh is the buttock. On

s appearing in parades and other public ceremonies, the croup may be decorated with a pattern in the horse's hair, formed by applying hair gel or spray, then brushing patches of hair in opposite directions. Applied to horses, the term "dock" has two additional uses. Its meaning may be extended to either the entire

minus the skirt (i.e., synonymous with tailbone) or the tailhead only. In other equidae, it encompasses most of the tailbone, as most of that portion of the tail does not have long hairs. A lack of long hairs can be natural, as in zebras, donkeys, and the Przewalski horse, or artificial, the result of pulling, trimming, or shaving part of the skirt (see Horse grooming). A sponge used to wash the hairless skin on the underside of the dock and other regions under the tail, protected by the dock, is called a dock sponge. Thus, the meaning of "dock" has been used to refer to the orifices beneath the dock, specifically the

anus The anus (Latin, 'ring' or 'circle') is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, ...

and

vagina In mammals, the vagina is the elastic, muscular part of the female genital tract. In humans, it extends from the vestibule to the cervix. The outer vaginal opening is normally partly covered by a thin layer of mucosal tissue called the hymen ...

, creating a misapprehension that "dock" refers to the anus, as in, ''a horse's fundamental orifice is its dock''., page 49

References

{{DEFAULTSORT:Rump (Animal) Bird anatomy Dog anatomy Horse anatomy Mammal anatomy