From the fact that the bony horn-core of the hollow-horned ruminants first develops as a separate ossification, as do the horns of the giraffe, while the pedicle of the antlers of the deer grow direct from the frontal bone, it has been proposed to place the hollow-horned ruminants (inclusive of the prongbuck) and the giraffes in one group and the deer in another.
An African origin has also been suggested for the hollow-horned ruminants (Bovidae); and if this were substantiated it would explain the abundance of that family in Africa and the absence from the heart of that continent of the deer-tribe.
In the absence of any trace of the lower extremities of the metacarpal and metatarsal bones of the lateral toes the skeleton differs from the American deer, and resembles those hollow-horned ruminants in which these toes persist.
TAKIN, the Mishmi name of a remarkable hollow-horned ruminant (Budorcas taxicolor), the typical representative of which inhabits the Mishmi Hills, in the south-east corner of Tibet, immediately north of the Assam Valley, while a second form is found further east, in the Moupin district.
The Bovidae, or hollow-horned ruminants, are represented by several genera of antelopes, and by species of true Bos - such as B.
ROCKY MOUNTAIN GOAT, or White Goat (Oreamnus montanus), a North American hollow-horned ruminant of the family Bovidae, distinguished by its white colour.
Lastly, we have the great family of hollow-horned ruminants or Bovidae, in which the horns (present in the males at least of all the existing species) take the form of simple non-deciduous hollow sheaths growing upon bony cores.
BOVIDAE, the name of the family of hollow-horned ruminant mammals typified by the common ox (Bos taurus), and specially characterized by the presence on the skulls of the males or of both sexes of a pair of bony projections, or cores, covered in life with hollow sheaths of horn, which are never branched, and at all events after a very early stage of existence are permanently retained.
Gadow is of opinion that the antlers of the deer, the hornlike protuberances on the skull of the giraffe, and the true horns of the prongbuck and other hollow-horned ruminants (Bovidae) are all different stages of evolution from a single common type: the antlers of the deer being the most primitive, and the horns of the Bovidae the most specialized.
Although many of the domesticated breeds are hornless, sheep belong to the family of hollow-horned ruminants or Bovidae.