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The koala is a robust animal with a large head and vestigial or non-existent tail. [11]: 1 [31] It has a body length of 60–85 cm (24–33 in) and a weight of 4–15 kg (8.8–33.1 lb), [31] making it among the largest arboreal marsupials. [32] Koalas from Victoria are twice as heavy as those from Queensland.
The extinct species are presumed to have similar diet and habits to the modern koala, the largest Australian folivore, which was exceeded in size by the even more robust P. stirtoni. [11] The tail of koalas is almost absent, an unusual characteristic for a tree climbing mammal, although other anatomical features are well suited to that habitat.
A white-tailed deer's tail. The tail is the elongated section at the rear end of a bilaterian animal's body; in general, the term refers to a distinct, flexible appendage extending backwards from the midline of the torso. In vertebrate animals that evolved to lose their tails (e.g. frogs and hominid primates), the coccyx is the homologous ...
Some babies retain an embryonic remnant of a tail, but this is extremely rare and such tails typically lack bone and cartilage and are not part of the spinal cord, another team of researchers ...
"Dogs do have full control of their tails; it is a highly specialized part of the body," says Dr. MacMillan. "They can control whether it is raised or lowered, as well as side-to-side movement.
The coccyx, or tailbone, is the remnant of a lost tail. [19] All mammals have a tail at some point in their development; in humans, it is present for a period of 4 weeks, during stages 14 to 22 of human embryogenesis. [20] This tail is most prominent in human embryos 31–35 days old. [21]
A coccyx with four vertebrae below the sacrum. The coccyx is formed of three, four or five rudimentary vertebrae.It articulates superiorly with the sacrum.In each of the first three segments may be traced a rudimentary body and articular and transverse processes; the last piece (sometimes the third) is a mere nodule of bone.
The Phascolarctidae (φάσκωλος (phaskolos) - pouch or bag, ἄρκτος (arktos) - bear, from the Greek phascolos + arctos meaning pouched bear) is a family of marsupials of the order Diprotodontia, consisting of only one extant species, the koala, [1] and six well-known fossil species, with another six less well known fossil species, and two fossil species of the genus Koobor, whose ...