Macrotis

Bilby
Greater bilby at Monarto Zoo
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Peramelemorphia
Family: Thylacomyidae
Bensley, 1903
Genus: Macrotis
Reid, 1837
Type species
Perameles lagotis
Reid, 1837
Species

Macrotis lagotis
† Macrotis leucura
† Ischnodon australis
† Liyamayi dayi

Synonyms

Paragalia Gray, 1841
Peragale Lydekker, 1887
Phalacomys anon., 1854
Thalaconus Richardson, Dallas, Cobbold, Baird and White, 1862
Thylacomys Blyth, 1840[1]

Bilbies, or rabbit-bandicoots,[2] are desert-dwelling marsupial omnivores; they are members of the order Peramelemorphia. At the time of European colonisation of Australia, there were two species. The lesser bilby became extinct in the 1950s; the greater bilby survives but remains endangered. It is currently listed as a vulnerable species. It is on average 55 cm long, excluding the tail, which is usually around 29 cm long. Its fur is usually grey or white, it has a long pointy nose and very long ears, hence earning its nick-name, the rabbit-eared bandicoot.

Etymology

Macrotis means ‘big-eared’ (macro- + ōt- ‘ear’) in Greek, referring to the animal's large, long ears.[3]

The family's current name Thylacomyidae is derived from an invalid synonym Thylacomys, meaning ‘pouched mouse’, from the Ancient Greek thýlakos (θύλακος, ‘pouch, sack’) and mys (μῦς, ‘mouse, muscle’),[2] sometimes misspelt Thalacomys.[4][5]

The term bilby is a loanword from the Yuwaalaraay Aboriginal language of northern New South Wales, meaning long-nosed rat. It is known as dalgite in Western Australia, and the nickname pinkie is sometimes used in South Australia.[6] The Wiradjuri of New South Wales also call it "bilby".[7]

Description

Bilbies have the characteristic long bandicoot muzzle and very big ears that radiate heat. They are about 29–55 cm (11–22 in) long. Compared to bandicoots, they have a longer tail, bigger ears, and softer, silky fur. The size of their ears allows them to have better hearing. They are nocturnal omnivores that do not need to drink water, as they obtain their moisture from food, which includes insects and their larvae, seeds, spiders, bulbs, fruit, fungi, and very small animals. Most food is found by digging or scratching in the soil, and using their very long tongues.

Unlike bandicoots, they are excellent burrowers and build extensive tunnel systems with their strong forelimbs and well-developed claws. A bilby typically makes a number of burrows within its home range, up to about a dozen, and moves between them, using them for shelter both from predators and the heat of the day. The female bilby's pouch faces backwards, which prevents the pouch from getting filled with dirt while she is digging.

Bilbies have a short gestation of about 12–14 days, one of the shortest among mammals.[8]

Conservation

Greater bilby at Sydney Wildlife World

Bilbies are slowly becoming endangered because of habitat loss and change, and competition with other animals. There is a national recovery plan being developed for saving them. This program includes captive breeding, monitoring populations, and reestablishing bilbies where they once lived. There have been reasonably successful moves to popularise the bilby as a native alternative to the Easter Bunny by selling chocolate Easter Bilbies (sometimes with a portion of the profits going to bilby protection and research). Reintroduction efforts have begun, with a successful reintroduction into the Arid Recovery Reserve in South Australia in 2000,[9] and plans are underway for a reintroduction into Currawinya National Park in Queensland,[10] where there was success with six bilbies released into the feral-free sanctuary in early February 2006.

Successful reintroductions have also occurred on the Peron Peninsula in Western Australia as a part of [11] Western Shield. Successful reintroductions have also occurred on other conservation lands, including islands and the Australian Wildlife Conservancy's[12] Scotia[13] and Yookamurra Sanctuaries.[14] There is a highly successful bilby breeding program at Kanyana Wildlife Rehabilitation Centre[15] near Perth, Western Australia.

Classification

The placement of bilbies within the taxonomic classification has changed in recent years. Vaughan (1978) and Groves and Flannery (1990) both placed this family within the family Peramelidae. Kirsch et al. (1997) found them to be distinct from the species in Peroryctidae (which is now a subfamily in Peramelidae). McKenna and Bell (1997) also placed it in Peramelidae, but as the sister of Chaeropus in the subfamily Chaeropodinae.[16]

Evolution

The bilby lineage extends back 15 million years.[17] In 2014 scientists found part of a 15-million-year-old fossilised jaw of a bilby which had shorter teeth that were probably used for eating forest fruit. Prior to this discovery, the oldest bilby fossil on record was 5 million years old. Modern bilbies have evolved to have long teeth used to dig holes in the desert to eat worms and insects.

It is thought the bilby diverged from its closest relative, an originally-carnivorous bandicoot, 20 million years ago.[18]

Species

2014 Royal Tour

On 20 April 2014, nine-month old Prince George of Cambridge visited the bilby enclsure at Taronga Zoo, Sydney, which was named in his honor when he was born.[21] The Duke and Duchess of Cambridge unveiled a statue of bilbies much to their son's delight and curiosity before he was given a stuffed version of Bilby George and a "Wild Child on Board" car tag.

See also

References

  1. ↑ Wilson & Reeder. "Genus Macrotis". Mammal Species of the World.
  2. 1 2 "Thylacomys". Merriam-Webster Dictionary. Unabridged (subscription required)
  3. ↑ Turner, Jim (2004). Mammals of Australia. Pensoft Publishers. p. 39. ISBN 978-954-642-198-2.
  4. ↑ "Thalacomys". Nomenclator Zoologicus Record. The Marine Biological Laboratory. err. pro Thyl- Owen 1838
  5. ↑ Waite, Edgar R. (1900). "The generic name Thylacomys". Annals and Magazine of Natural History: Series 7. 5 (26): 222–223. doi:10.1080/00222930008678272.
  6. ↑ "Home - Australian National Dictionary Centre". ANU. Retrieved 2014-04-22.
  7. ↑ Archived 28 September 2006 at the Wayback Machine.
  8. ↑ Gordon, Greg (1984). Macdonald, D., ed. The Encyclopedia of Mammals. New York: Facts on File. pp. 846–849. ISBN 0-87196-871-1.
  9. ↑ Moseby K. E. and O'Donnell E. O. (2003) Reintroduction of the greater bilby, Macrotis lagotis (Reid) (Marsupialia: Thylacomyidae), to northern South Australia: survival, ecology and notes on reintroduction protocols Wildlife Research 30, 15-27.
  10. ↑ Queensland Government (2004) Save The Bilby Appeal
  11. ↑ "Western Australian Department of Environment and Conservation 'Project Eden'". Naturebase.net. Retrieved 2014-04-22.
  12. ↑ "Australian Wildlife Conservancy". Awc.org.au. Retrieved 2014-04-22.
  13. ↑ Australian Wildlife Conservancy Scotia Sanctuary
  14. ↑ Australian Wildlife Conservancy Yookamurra Sanctuary
  15. ↑ "Kanyana Wildlife Rehabilitation Centre (Inc.)". Kanyanawildlife.org.au. Retrieved 2014-04-22.
  16. ↑ Groves, C.P. (2005). Wilson, D.E.; Reeder, D.M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 38. OCLC 62265494. ISBN 0-801-88221-4.
  17. ↑ 15-million-year-old bilby fossil found in Qld, Australian Geographic.
  18. ↑ Carnivorous bilby fossil unearthed, Australian Geographic.
  19. ↑ Stirton, R.A., 1955. Late tertiary marsupials from South Australia. Records of the South Australian Museum 11, 247-268.
  20. ↑ Travouillon, K.J.; Hand, S. J.; Archer, M.; Black, K. H. (2014). "Earliest modern bandicoot and bilby (Marsupialia, Peramelidae and Thylacomyidae) from the Miocene of the Riversleigh World Heritage Area, northwestern Queensland, Australia". Journal of Vertebrate Paleontology. 34: 375–382. doi:10.1080/02724634.2013.799071.
  21. ↑ "Prince George wows Sydney as picture-perfect royals visit the zoo". The Sydney Morning Herald. 20 April 2014. Retrieved 21 November 2016.
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