Gray's beaked whale (''Mesoplodon grayi''), sometimes known as Haast's beaked whale, the scamperdown whale, or the southern beaked whale, is one of the better-known members of the genus ''

Mesoplodon Mesoplodont whales are 16 species of toothed whale in the genus ''Mesoplodon'', making it the largest genus in the cetacean order. Two species were described as recently as 1991 (pygmy beaked whale) and 2002 (Perrin's beaked whale), and marine ...

''. This species is fairly gregarious and strands relatively frequently for a

beaked whale Beaked whales ( systematic name Ziphiidae) are a family of cetaceans noted as being one of the least known groups of mammals because of their deep-sea habitat and apparent low abundance. Only three or four of the 24 species are reasonably well- ...

. In the

Māori language Māori (), or ('the Māori language'), also known as ('the language'), is an Eastern Polynesian language spoken by the Māori people, the indigenous population of mainland New Zealand. Closely related to Cook Islands Māori, Tuamotuan, and ...

, this species is called ''hakurā'' or ''iheihe''.

Taxonomy

The species was first described in 1876 by

Julius von Haast Sir Johann Franz Julius von Haast (1 May 1822 – 16 August 1887) was a German-born New Zealand explorer, geologist, and founder of the Canterbury Museum in Christchurch. Early life Johann Franz Julius Haast was born on 1 May 1822 in Bo ...

, director of the Canterbury Museum,

Christchurch Christchurch ( ; mi, Ōtautahi) is the largest city in the South Island of New Zealand and the seat of the Canterbury Region. Christchurch lies on the South Island's east coast, just north of Banks Peninsula on Pegasus Bay. The Avon Rive ...

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island coun ...

. He named it after the

British British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, ...

taxonomist

John Edward Gray John Edward Gray, FRS (12 February 1800 – 7 March 1875) was a British zoologist. He was the elder brother of zoologist George Robert Gray and son of the pharmacologist and botanist Samuel Frederick Gray (1766–1828). The same is used f ...

, a zoologist at the

British Museum The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It docum ...

. His description was based on three skulls he had received in May 1875 from a Louis Walter Hood Esq. (1837 – 11 February 1912, generally known as Walter) the storekeeper at Waitangi,

Chatham Island Chatham Island ( ) (Moriori: ''Rēkohu'', 'Misty Sun'; mi, Wharekauri) is by far the largest island of the Chatham Islands group, in the south Pacific Ocean off the eastern coast of New Zealand's South Island. It is said to be "halfway bet ...

, who had retrieved them from three specimens that were part of a group of 28 individuals that had stranded on Waitangi Beach in the summer of 1874–75.

Description

Gray's beaked whale is a fairly slender member of the genus. The

melon A melon is any of various plants of the family Cucurbitaceae with sweet, edible, and fleshy fruit. The word "melon" can refer to either the plant or specifically to the fruit. Botanically, a melon is a kind of berry, specifically a "pepo". T ...

on the whale bulges towards the blowhole and slopes down towards the beak. The beak itself is very long and pointed for a beaked whale, and has a relatively straight mouth line. In both sexes, 17–22 small teeth per row located towards the back of the mouth have been reported, but not confirmed. In males, two small, triangular teeth are present halfway down the mouth. The overall coloration is dark on top and light below, and both sexes have a white beak. Females are lighter on top and have additional white markings near the genitals. Adult males often carry linear scars that probably result from fighting, and both males and females may display circular scars from

cookiecutter shark The cookiecutter shark (''Isistius brasiliensis''), also called the cigar shark, is a species of small squaliform shark in the family Dalatiidae. This shark occurs in warm, oceanic waters worldwide, particularly near islands, and has been rec ...

bites.Gray's Beaked Whale
Australian Museum. Updated 13 October 2009. Retrieved 13 January 2011. ''M. grayi'' are long and weigh around . They are believed to be around long when born.

Behavior

Beached whale (Mesoplodon grayi) at Port Waikato

Gray's beaked whale is very gregarious. It has a tendency to strand in large groups, once involving 28 individuals. Other strandings involved five to eight animals. The upper teeth may be used in holding prey, but why only this species has them is not clear. Gray's beaked whale is said to be the most common species of whale to beach in New Zealand. Two whales that stranded themselves on Opape Beach in the

Bay of Plenty The Bay of Plenty ( mi, Te Moana-a-Toi) is a region of New Zealand, situated around a bight of the same name in the northern coast of the North Island. The bight stretches 260 km from the Coromandel Peninsula in the west to Cape Runaw ...

, in December 2010, were initially thought to be Gray's beaked whales, but later found to be the very rare spade-toothed whale.

Population and distribution

This species typically lives in the Southern Hemisphere between 30 and 45°, and is typically observed at depths of . Many strandings have occurred off New Zealand, but others have happened off

Australia Australia, officially the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands. With an area of , Australia is the largest country by ...

South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring coun ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sou ...

, and the

Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouze ...

. This species has been sighted in groups off the coast of

Madagascar Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Afric ...

and in the

Antarctic The Antarctic ( or , American English also or ; commonly ) is a polar region around Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica, the Kerguelen Plateau and othe ...

area. Oddly, one specimen stranded off the

Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...

, in a different hemisphere and several thousand miles away from all other strandings. No population estimates exist, but they are believed to be rather common.

Conservation

These whales have not been hunted deliberately and they have not been entangled in fishing gear. Gray's beaked whale is included in the Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia ( Western African Aquatic Mammals MoU) and the Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region ( Pacific Cetaceans MoU)

Specimens

MNZ MM002134 Gray's Beaked Whale Mesoplodon grayi
collected Black Reef, Cape Kidnappers, Hawke Bay, New Zealand, 18 March 1993.

References

Bibliography

*''Encyclopedia of Marine Mammals''. Edited by William F. Perrin, Bernd Wursig, and J.G.M Thewissen. Academic Press, 2002. *''Sea Mammals of the World''. Written by Randall R. Reeves, Brent S. Steward, Phillip J. Clapham, and James A. Owell. A & C Black, London, 2002.

External links

Factsheets - Gray's Beaked WhaleWhale & Dolphin Conservation Society (WDCS)
* ttp://www.pacificcetaceans.org/ Official webpage of the Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region {{Taxonbar, from=Q943889 Mesoplodont whales Cetaceans of the Pacific Ocean Mammals described in 1876 Taxa named by Julius von Haast