Northern hairy-nosed wombat
The northern hairy-nosed wombat (Lasiorhinus krefftii), is one of three species of wombats. It is one of the rarest large mammals in the world and is critically endangered. Its historical range extended across New South Wales, Victoria and Queensland as recently as 100 years ago, but it is now restricted to one place, a 3 km² range within the 32 km² Epping Forest National Park in Queensland. In 2003 the total population consisted of 113 individuals, including only around 30 breeding females.
Northern hairy-nosed wombats can be 35 cm high, up to 1 m long and up to 40 kg. The females are a little bit bigger than the males because they have an extra layer of fat. It is slightly larger than the common wombat and able to breed somewhat faster (two young every three years). The northern hairy-nosed wombat's nose is very important in their survival because they have very poor eyesight so they can smell their food in the dark. It takes about a day for a northern hairy-nosed wombat to dig a burrow with their sharp claws (The wombat's claws are about 5 cm in length).
The northern hairy-nosed wombat is nocturnal, and has been known to share burrows. Its diet is made up of coarse grass and various types of roots. Its habitat has become infested with African buffel grass, which out-competes the native grasses the wombat prefers to feed on. One young can be born, often during the wet season. It stays in the pouch for 6–9 months, leaving its mother after a year.
The genus name Lasiorhinus comes from the Latin lasios (hairy or shaggy) and rhinus (nose). The widely accepted common name is northern hairy-nosed wombat, although in some older literature it is referred to as the Queensland hairy-nosed wombat.
The northern hairy-nosed wombat shares its genus with one other extant species, the southern hairy-nosed wombat. The other extant species in the Vombatidae family, the common wombat, is in the Vombatidae genus. Both Lasiorhinus species are very similar, differing morphologically from the common wombat by their silkier fur, broader hairy noses and longer ears.
Placental and marsupial mammals are an example of divergent evolution, an evolutionary concept occurring when a single group of organisms splits into two groups and each group evolves in increasingly different directions. The wombat, with all marsupials, diverged from placental mammals during the Cretaceous. The koala is the most closely related marsupial to wombats and is categorised in the same suborder, Vombatiformes.
The northern hairy-nosed wombat is listed as "endangered" by the Australian Species Profile and Threats Database (SPRAT), and "critically endangered" by the IUCN. Its range is restricted to about 300 ha (750 acres) of the Epping Forest in east-central Queensland, 120 km northwest of Clermont. A two metre-high predator-proof fence was constructed around 25 km² of the park in 2000. Recently, a second colony of wombats has been established at Richard Underwood Nature Refuge at Yarran Downs near St George in southern Queensland. This second colony was established in 2008 and is also in a reserve surrounded by a predator proof fence.
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- Gordon, G.; Riney, T., Toop, J., Lawrie, B.C., Godwin, M.D. (1985). "Observations on the Queensland Hairy-nosed Wombat, Lasiorhinus krefftii (Owen)". Biological Conservation 33: 165–195.
- Horsup, A. "Recovery plan for the northern hairy-nosed wombat Lasiorhinus krefftii 2004-2008". Report to the Department of Environment and Heritage, Canberra.
- Triggs, B (2009). Wombats. Collingwood, Australia: CSIRO Publishing.
- "Lasiorhinus krefftii Northern Hairy-nosed Wombat". Species Profile and Threats Database. http://www.deh.gov.au/cgi-bin/sprat/public/publicspecies.pl?taxon_id=198. Retrieved 2007-01-05.
- Department of Environment and Resource Management. "Northern hairy-nosed wombat". Queensland Government. http://www.derm.qld.gov.au/wildlife-ecosystems/wildlife/threatened_plants_and_animals/endangered/northern_hairynosed_wombat/.