Pygmy Beaked Whale
From Encyclopedia Jr, free information reference for Kids
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Data deficient (DD)
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| Mesoplodon peruvianus Reyes, Mead, and Van Waerebeek, 1991 |
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 Pygmy Beaked Whale range
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The Pygmy Beaked Whale (Mesoplodon peruvianus), also known as the Peruvian Beaked Whale and Lesser Beak Whale, is the smallest of the Mesoplodonts and one of the newest discoveries. Interestingly, there were at least two dozen sightings of an unknown beaked whale named Mesoplodon sp. A before the initial classification, and those are now believed to be synonymous with the species. Physical evidence of the species was first described in 1990 from Baja California, consisting of a skeleton and a rotting carcass.
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[edit] Physical description
The body of the Pygmy Beaked Whale is the rather typical spindle shape of the genus, although the tail is unusually thick. The melon is somewhat bulbous and slopes down into a rather short beak. The mouthline in males has a very distinct arch with two teeth protruding slightly from the gum line before the apex. The coloration is typically dark gray on the top and lighter below, especially on the lower jaw, throat, and behind the umbililicus. Males may have a distinct pale "chevron" pattern on their back. The size for this species in only around 4.5 meters (13 feet long) in mature animals, and around 1.6 meters (5 feet) when born.
[edit] Population and distribution
This Beaked Whale has been recorded in the eastern tropical Pacific between Baha California and Peru through sightings and strandings. Another specimen, apparently of the same species, washed up in New Zealand, which indicates a presence in the western Pacific as well. No population estimates have been made.
[edit] Behavior
Little is known about the group behaviors of this whale, and small groups have been seen. Stomach contents reveal at least one specimen is a fish eater, as opposed to the squid normally eaten by the genus.
[edit] Conservation
This species may be quite vulnerable to gillnets in Peru, since scientists found 6 dead adults in a very small sample. However, there is not enough evidence to determine anything about the species.
[edit] References
- Cetacean Specialist Group (1996). Mesoplodon peruvianus. 2006
- Encyclopedia of Marine Mammals. Edited by William F. Perrin, Bernd Wursig, and J.G.M Thewissen. Academic Press, 2002. ISBN 0-12-551340-2
- 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. ISBN 0-7136-6334-0