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Little penguin

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"Kororā" redirects here. For the extinct penguin genus, see Korora.
This article is about the species endemic to New Zealand. For the species found in Australia and Otago, New Zealand, see Eudyptula novaehollandiae.

Little penguin
Little penguin (Eudyptula minor), moving up from the shore at night towards its burrow on Kapiti Island, New Zealand.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Sphenisciformes
Family: Spheniscidae
Genus: Eudyptula
Species:
E. minor
Binomial name
Eudyptula minor
(Forster, 1781)
The range of Eudyptula minor is in blue.[2]

The little penguin (Eudyptula minor) is a species of penguin from New Zealand. They are commonly known as fairy penguins, little blue penguins, or blue penguins, owing to their slate-blue plumage and are also known by their Māori name kororā. They are fossorial birds.[3]

The Australian little penguin (Eudyptula novaehollandiae), from Australia and the Otago region of New Zealand, is considered a separate species by a 2016 study[4] and a 2019 study.[5]

Taxonomy

A white-flippered penguin in the South Island.

The little penguin was first described by German naturalist Johann Reinhold Forster in 1781. Several subspecies are known, but a precise classification of these is still a matter of dispute. The holotypes of the subspecies E. m. variabilis[6] and Eudyptula minor chathamensis[7] are in the collection of the Museum of New Zealand Te Papa Tongarewa. The white-flippered penguin (E. m. albosignata or E. m. minor morpha albosignata) is currently considered by most taxonomists to be a colour morph or subspecies of Eudyptula minor. In 2008, Shirihai treated the little penguin and white-flippered penguin as allospecies.[8] However, as of 2012, the IUCN and BirdLife International consider the white-flippered penguin to be a subspecies or morph of the little penguin.

Little penguins from New Zealand and Australia were once considered to be the same species, called Eudyptula minor. Analysis of mtDNA in 2002 revealed two clades in Eudyptula: one containing little penguins of New Zealand's North Island, Cook Strait and Chatham Island, as well as the white-flippered penguin, and a second containing little penguins of Australia and the Otago region of New Zealand.[9] Preliminary analysis of braying calls and cluster analysis of morphometrics partially supported these results.[9] A 2016 study described the Australian little penguin as a new and separate species, Eudyptula novaehollandiae. E. minor is endemic to New Zealand, while E. novaehollandiae is found in Australia and Otago.[4] A 2019 study supported the recognition of E. minor and E. novaehollandiae as separate species.[5]

Description

Like those of all penguins, the wings of Eudyptula species have developed into flippers used for swimming.

Eudyptula species typically grow to between 30 and 33 cm (12 and 13 in) tall and on average weigh 1.5 kg (3.3 lb). The head and upper parts are blue in colour, with slate-grey ear coverts fading to white underneath, from the chin to the belly. Their flippers are blue in colour. The dark grey-black beak is 3–4 cm long, the irises pale silvery- or bluish-grey or hazel, and the feet pink above with black soles and webbing. An immature individual will have a shorter bill and lighter upperparts.[10]

Like most seabirds, the Eudyptula species have a long lifespan. The average for the species is 6.5 years, but flipper ringing experiments show that in very exceptional cases they may live up to 25 years in captivity.[11]

Eudyptula minor does not have the distinct bright blue feathers that distinguish Eudyptula novaehollandiae. In addition, the vocalisation patterns of the New Zealand lineage located on Tiritiri Matangi Island vary from the Australian lineage located in Oamaru. Females are known to prefer the local call of the New Zealand lineage.

There are also behavioural differences that help differentiate these penguins. Those of the Australian lineage will swim together in a large group after dusk and walk along the shore to reach their nesting sites. This may be an effective predator avoidance strategy by traveling in a large group simultaneously. This has not been seen by those of the New Zealand lineage. Eudyptula minor only recently encountered terrestrial vertebrate predators, while Eudyptula novaehollandiae would have had to deal with carnivorous marsupials.

Australian Eudyptula novaehollandiae have been observed to double brood. Birds will double brood by laying a second clutch of eggs after the first has fledged to increase their reproductive success. They may also do this due to the increasing sea surface temperatures and changing sources of food that are available. This behaviour has also been observed in the Otago population, indicating this may be genetically-mediated behaviour in the populations of Australian lineage.[12]

Distribution and habitat

See also: List of little penguin colonies § New Zealand

Eudyptula minor breeds along most of the coastline of New Zealand, including the Chatham Islands. However, Eudyptula minor does not occur in Otago, which is located on the east coast of New Zealand's South Island. The Australian species Eudyptula novaehollandiae occurs in Otago.[13] E. novaehollandiae was originally endemic to Australia. Using ancient-DNA analysis and radiocarbon dating using historical, pre-human, as well as archaeological Eudyptula remains, the arrival of the Australian species in New Zealand was determined to have occurred roughly between AD 1500 and 1900. When the E. minor population declined in New Zealand, it left a genetic opening for E. novaehollandiae. The decrease of E. minor was most likely due to anthropogenic effects, such as being hunted by humans as well as introduced predators,[14] including dogs brought from overseas.

It has been determined that the population of Eudyptula novaehollandiae in Otago arrived even more recently than previously estimated due to mulitlocus coalescent analyses.[15]

Overall, little penguin populations in New Zealand have been decreasing. Some colonies have become extinct, and others continue to be at risk.[16] Some new colonies have been established in urban areas.[17] The species is not considered endangered in New Zealand, with the exception of the white-flippered subspecies found only on Banks Peninsula and nearby Motunau Island. Since the 1960s, the mainland population has declined by 60-70%; though a small increase has occurred on Motunau Island. A colony exists in Wellington Harbor on Matiu / Somes Island.[18]

Behaviour

Feeding

Little penguins feed by hunting small clupeoid fish, cephalopods, and crustaceans, for which they travel and dive quite extensively[19][20] including to the sea floor. Important little penguin prey items include arrow squid, slender sprat, Graham's gudgeon, red cod, and ahuru.[21]

Threats

Traffic sign warning of little penguins crossing on the West Coast of New Zealand

Protestors have opposed the development of a marina at Kennedy Point, Waiheke Island in New Zealand for the risk it poses to little penguins and their habitat.[22] Protesters claimed that they exhausted all legal means to oppose the project and have had to resort to occupation and non-violent resistance. Several arrests have been made for trespassing.[23]

Introduced predators

Introduced mammalian predators present the greatest terrestrial risk to little penguins and include cats, dogs, rats, and particularly ferrets and stoats.[17][16] As examples significant dog attacks have been recorded at the colony at Little Kaiteriteri Beach,[24] and a suspected stoat or ferret attack at Doctor's Point near Dunedin, New Zealand claimed the lives of 29 little blue penguins in November 2014.[25]

Oil spills

Little penguin populations have been significantly affected by a major oil spill with the grounding of the Rena off New Zealand in 2011, which killed 2,000 seabirds (including little penguins) directly, and killed an estimated 20,000 in total based on wider ecosystem impacts.[26][27] Oil spills are the most common cause of the little penguins being admitted to the rehabilitation facilities at Phillip Island Nature Park (PINP). These oil spill recurrences have endangered not just the little penguins, but the entire penguin population. This can further decline the population, which can lead to possible extinction.[28]

Conservation

Eudyptula species are classified as "at risk - declining" under New Zealand's Wildlife Act 1953.[29]

Zoological exhibits

Little penguins at the Birch Aquarium, La Jolla

Some of the institutions featuring purpose-built enclosures for Eudyptula to be seen in Australia include the Adelaide Zoo, the Melbourne Zoo, the National Zoo & Aquarium in Canberra, the Perth Zoo and Caversham Wildlife Park (also in Perth), Ballarat Wildlife Park, Sea Life Sydney Aquarium,[30] and the Taronga Zoo, also in Sydney.[31][32][33][34][35][36][37]

Exhibits and enclosures for Eudyptula (and indeed all captive penguin species) typically include a saltwater swimming pool of some sort for the birds, with a simulated beach area behind it, and nesting locations placed further back; the Eudyptula exhibit at San Diego, California's Birch Aquarium was constructed with an 18,000 gallon (over 68,000 litres) pool for the birds. The exhibits at many institutions also feature transparent glass "viewing walls" to watch the birds whilst they swim underwater. Some facilities may or may not have both indoor and/or outdoor areas for the penguins, depending on seasonality, local weather patterns, etc. The majority of enclosures make use of nesting boxes, or similar "hide" structures, for the birds to retire into, usually at the back of the exhibit.

Eudyptula penguins are also on display at Sea World, on the Gold Coast, Queensland, Australia. In early March 2007, some 25 of the park’s 37 little penguins died from exposure to an unknown toxin following a change of gravel in their enclosure.[38][39][40] It was not clear what, specifically, caused the deaths of the birds, thus it was decided not to return the 12 survivors to the same enclosure where the deceased birds first became ill.[41] A new enclosure for the little penguin colony was opened at Sea World the following year.[42]

In New Zealand, Eudyptula penguin exhibits exist at the Auckland Zoo, the Wellington Zoo, and the National Aquarium of New Zealand.[43] Since 2017, the National Aquarium of New Zealand has featured a monthly "Penguin of the Month" board, declaring two of their resident animals the "Naughty" and "Nice" penguin for that month. Photos of the board have gone viral and gained the aquarium a large worldwide social media following.[44]

In the United States, Eudyptula penguins can be seen at the Smithsonian National Zoo in Washington, DC, Dallas Zoo, Louisville Zoo[45] New York City's Bronx Zoo,[46] and the Cincinnati Zoo, as well as the aforementioned Birch Aquarium in San Diego, located at the Scripps Institute of Oceanography, on the University of California, San Diego (UCSD) campus.[47][48]

See also

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Notes

  1. ^ This IUCN assessment treats Eudyptula minor and Eudyptula novaehollandiae as just one species.

References

  1. ^ BirdLife International (2020). "Eudyptula minor". IUCN Red List of Threatened Species. 2020: e.T22697805A202126091. doi:10.2305/IUCN.UK.2020-3.RLTS.T22697805A202126091.en. Retrieved 13 November 2021.
  2. ^ "Fig 1. Map of distribution of Eudyptula penguins. Blue and red colours..." ResearchGate. Retrieved 15 May 2022.
  3. ^ "Fossorial animals". Animalia.bio. Retrieved 22 December 2023.
  4. ^ a b Grosser, Stefanie; Rawlence, Nicolas J.; Anderson, Christian N. K.; Smith, Ian W. G.; Scofield, R. Paul; Waters, Jonathan M. (10 February 2016). "Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins". Proceedings of the Royal Society B: Biological Sciences. 283 (1824): 20152879. doi:10.1098/rspb.2015.2879. ISSN 0962-8452. PMC 4760177. PMID 26842575.
  5. ^ a b Cole, Theresa L; Ksepka, Daniel T; Mitchell, Kieren J; Tennyson, Alan J D; Thomas, Daniel B; Pan, Hailin; Zhang, Guojie; Rawlence, Nicolas J; Wood, Jamie R; Bover, Pere; Bouzat, Juan L (1 April 2019). "Mitogenomes Uncover Extinct Penguin Taxa and Reveal Island Formation as a Key Driver of Speciation". Molecular Biology and Evolution. 36 (4): 784–797. doi:10.1093/molbev/msz017. ISSN 0737-4038. PMID 30722030.
  6. ^ "Eudyptula minor variabilis; holotype". Collections Online. Museum of New Zealand Te Papa Tongarewa. Retrieved 17 July 2010.
  7. ^ "Eudyptula minor chathamensis; holotype". Collections Online. Museum of New Zealand Te Papa Tongarewa. Retrieved 17 July 2010.
  8. ^ Shirihai, Hadoram (2008). The Complete Guide to Antarctic Wildlife, 2d Edition. Princeton University Press.
  9. ^ a b Banks, Jonathan C.; Mitchell, Anthony D.; Waas, Joseph R. & Paterson, Adrian M. (2002): An unexpected pattern of molecular divergence within the blue penguin (Eudyptula minor) complex. Notornis 49(1): 29–38. PDF fulltext
  10. ^ Williams, Tony D. (1995). The penguins : Spheniscidae. Rory P. Wilson, P. Dee Boersma, David L. Stokes, Jeff Davies, John Busby. Oxford: Oxford University Press. ISBN 0-19-854667-X. OCLC 30736089.
  11. ^ Dann, Peter (2005). "Longevity in Little Penguins" (PDF). Marine Ornithology (33): 71–72. Retrieved 17 September 2012.
  12. ^ Grosser, Stefanie; Burridge, Christopher P.; Peucker, Amanda J.; Waters, Jonathan M. (14 December 2015). "Coalescent Modelling Suggests Recent Secondary-Contact of Cryptic Penguin Species". PLOS ONE. 10 (12): e0144966. Bibcode:2015PLoSO..1044966G. doi:10.1371/journal.pone.0144966. PMC 4682933. PMID 26675310.
  13. ^ "Australian and New Zealand Little Blue Penguins are Different Species". MessagetoEagle.com. 16 December 2015. Retrieved 12 May 2016.
  14. ^ Grosser, Stefanie. "NZ's southern little penguins are recent Aussie invaders: Otago research". University of Otago. University of Otago: Department of Zoology. Retrieved 11 May 2016.
  15. ^ Grosser, Stefanie; Burridge, Christopher P.; Peucker, Amanda J.; Waters, Jonathan M. (14 December 2015). "Coalescent Modelling Suggests Recent Secondary-Contact of Cryptic Penguin Species". PLOS ONE. 10 (12): e0144966. Bibcode:2015PLoSO..1044966G. doi:10.1371/journal.pone.0144966. PMC 4682933. PMID 26675310.
  16. ^ a b Dann, Peter. "Penguins: Little (Blue or Fairy) Penguins - Eudyptula minor". International Penguin Conservation Work Group. Retrieved 25 November 2011.
  17. ^ a b Grabski, Valerie (2009). "Little Penguin - Penguin Project". Penguin Sentinels/University of Washington. Archived from the original on 16 December 2011. Retrieved 25 November 2011.
  18. ^ "Matiu/Somes Island - Nature and conservation". Department of Conservation. New Zealand Government. Retrieved 3 November 2023.
  19. ^ Flemming, S.A., Lalas, C., and van Heezik, Y. (2013) "Little penguin (Eudyptula minor) diet at three breeding colonies in New Zealand". New Zealand Journal of Ecology 37: 199–205 Accessed 30 January 2014.
  20. ^ "Little Penguin Factsheet" Auckland Council, New Zealand (28 February 2014). Retrieved 2014-07-26.
  21. ^ Flemming, S.A. (2013) "[1]". In Miskelly, C.M. (ed.) New Zealand Birds Online
  22. ^ "Police arrest three at Waiheke Island marina protest". NZ Herald. Retrieved 17 June 2021.
  23. ^ "Arrests at Waiheke's Kennedy Point as fight to protect penguins escalates". Stuff. 17 June 2021. Retrieved 17 June 2021.
  24. ^ Carson, Jonathan (3 September 2014). "DOC devastated by death of penguins". The Nelson Mail. Retrieved 4 September 2014.
  25. ^ Mead, Thomas (5 November 2014). "Stoat suspected in Little blue penguin massacre". 3 News. Archived from the original on 11 November 2014. Retrieved 11 November 2014.
  26. ^ Backhouse, Matthew (28 December 2011). "Penguin reigns in battle for nation's hearts". The New Zealand Herald. Retrieved 28 March 2012.
  27. ^ "Rena: Oil clean-up chemical worries Greenpeace". The New Zealand Herald. 25 November 2011. Retrieved 28 March 2012.
  28. ^ Goldsworthy, S. D.; Giese, M.; Gales, R. P.; Brothers, N.; Hamill, J. (2000). "Effects of the Iron Baron oil spill on little penguins (Eudyptula minor). II. Post-release survival of rehabilitated oiled birds". Wildlife Research. 27 (6): 573–582. doi:10.1071/wr99076. ISSN 1448-5494.
  29. ^ "Wildlife Act 1953 No 31 (as at 02 August 2019), Public Act Contents – New Zealand Legislation". legislation.govt.nz. Retrieved 28 May 2020.
  30. ^ Sea Life Sydney Aquarium
  31. ^ "Little Blue Penguin" (PDF). Zoos South Australia. Archived from the original (PDF) on 15 May 2013. Retrieved 12 March 2014.
  32. ^ "Little Penguin". Zoos Victoria. Retrieved 12 March 2014.
  33. ^ "AdventureTrail" (PDF). National Zoo & Aquarium. Archived from the original (PDF) on 12 March 2014. Retrieved 12 March 2014.
  34. ^ "Little Penguin". Perth Zoo. Archived from the original on 28 February 2014. Retrieved 12 March 2014.
  35. ^ "Australian Little Penguin". Taronga Conservation Society Australia. Archived from the original on 24 March 2014. Retrieved 12 March 2014.
  36. ^ "Little Penguins | SEA LIFE Sydney Aquarium". www.sydneyaquarium.com.au. Retrieved 23 April 2020.
  37. ^ "Little Penguins". Ballarat Wildlife Park. Retrieved 21 April 2020.
  38. ^ "Mystery penguin deaths at Sea World". Australian Broadcasting Corporation. Retrieved 15 August 2012.
  39. ^ Authorities find unknown toxin in Sea World Penguins Archived 13 February 2011 at the Wayback Machine
  40. ^ Sea World probes mysterious deaths Archived 13 February 2011 at the Wayback Machine
  41. ^ Penguin deaths remain a mystery Archived 21 March 2008 at the Wayback Machine
  42. ^ "Seaworld opens new haven for penguins". Brisbane Times. 8 March 2008. Retrieved 24 January 2019.
  43. ^ National Aquarium of New Zealand > New Zealand Land Animals - Little Penguin, Nationalaquarium.vo.nz, Accessed 27 December 2014
  44. ^ "Naughty Penguin of the Month is Giving Twitter Life to this Viral Thread". Bustle.com. 21 July 2018. Retrieved 27 December 2021.
  45. ^ "Penguin Cove – Little Penguin Conservation Center". Louisville Zoo. 20 April 2016. Retrieved 21 April 2020.
  46. ^ "Little Penguins Make a Big Splash - Bronx Zoo". bronxzoo.com. Retrieved 21 April 2020.
  47. ^ "Cincinnati Zoo Visitors Over the Moon for Penguin Ambassadors Mars and Rover". Cincinnati Zoo & Botanical Garden®. 21 May 2021. Retrieved 9 March 2023.
  48. ^ "Little Blue Penguin". Cincinnati Zoo & Botanical Garden®. Retrieved 9 March 2023.

Further reading

  • Williams, Tony D. (1995). The Penguins. Oxford, England: Oxford University Press. ISBN 0-19-854667-X.
Wikispecies has information related to Eudyptula minor.
Wikimedia Commons has media related to Eudyptula minor.
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