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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.
Recent research indicates that, in non-human primates, whole brain size is a better measure of cognitive abilities than brain-to-body mass ratio. The total weight of the species is greater than the predicted sample only if the frontal lobe is adjusted for spatial relation. [19]
The giant koala (Phascolarctos stirtoni) is an extinct arboreal marsupial which existed in Australia during the Pleistocene epoch. Phascolarctos stirtoni was about one-third larger than the contemporary koala , P. cinereus , [ 2 ] and has an estimated weight of 13 kg (29 lb), which is the same weight as a large contemporary male koala.
Encephalization quotient (EQ), encephalization level (EL), or just encephalization is a relative brain size measure that is defined as the ratio between observed and predicted brain mass for an animal of a given size, based on nonlinear regression on a range of reference species.
The koala is listed in national conservation legislation as "Phascolarctos cinereus (combined populations of Qld, NSW and the ACT)", previously determined in 2012 to be "a species for the purposes of the EPBC act 1999" . [7] The koala was classified as Least Concern on the Red List, and reassessed as Vulnerable in 2014. [8]
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A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [21]
The root box is estimated from a measurement of the wing width at the base (the root chord) and the difference between the wingspan and two times the extent of a single wing. [10] Alternatively, the total wing area can be estimated using the wingspan, wing length, and wing width and assuming simple geometric figures for the shape of the wings.