What do dwarf sperm whales eat? Notice the “false gill” marking on the side of the head, behind the eye; its purpose is unknown, but may be an example of shark mimicry.The vast majority of information available on this species comes from strandings, including several live-strandings.
They are often difficult to observe at sea and probably are much more common than sighting records would suggest.
In South Africa, they take at least 67 different prey species, and appear to feed in deeper waters than do dwarf sperm whales.Although they have never been taken in large numbers, either directly or incidentally in fisheries, pygmy sperm whales have been occasional victims of dolphin and small whale fisheries, as well as gillnet and purse seine operations.
The spermaceti is an oil sac that helps the whales produce sound. 0000001830 00000 n
It is the only living member of the genus Physeter and one of three surviving species in the sperm whale family, along with the Pygmy Sperm Whale and Dwarf Sperm Whale of the genus Kogia.
0000003412 00000 n They may simply sink out of sight, or may roll to dive (especially if startled). However, captive animals have sometimes shown intense levels of activity. 0000002151 00000 n 0000006208 00000 n 0000001891 00000 n Pygmy sperm whales are found in temperate and tropical seas worldwide.
In pygmy sperm whales, the blowhole is positioned >10% of the way back from the snout tip.
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Elsevier, Amsterdam (their image on p. 98).White Shark Predation and Scavenging on Cetaceans in the Eastern North Pacific Ocean. The center of its body is stocky but tapers down the closer you get the tail and flukes. 0000033794 00000 n Pygmy sperm whales enjoy temperate and tropical seas across the globe and are hard to distinguish from other dwarf sperm whales. 0000005387 00000 n The dwarf sperm whale ranges throughout tropical and temperate oceans of the world and inhabits the continental shelf and slopearea. The frequency with which they strand in some areas (such as Florida and South Africa) suggests that they may not always be as uncommon as sightings would suggest.Most sightings of pygmy sperm whales are of small groups of less than five or six individuals.
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They are at least occasionally preyed upon by sharks and killer whales.A pygmy sperm whale, which stranded in Florida, in an oceanarium tank. 1991; Mullin and Fulling 2004). Exact lengths of breeding seasons differ among taxa and can vary geographically within species.
%PDF-1.4 %���� 0000008370 00000 n The answer is yes. 0000038959 00000 n
0000092042 00000 n Pygmy sperm whales may also emit a reddish-brown fluid from the anal area when startled. The maximum productivity rate is 0.04, the default value for cetaceans. 0000029838 00000 n
0000011203 00000 n As stated previously when fully grown the dwarf sperm whale measures in at around 9 ft. long and weighs an average of 400 lbs.
Sexual maturity in South Africa appears to be reached at ages between 2.5 and 5 years. He based this on the head of an individual washed up on the coasts of Audierne in France in 1784, which was then stored in the Muséum d'histoire naturelle.
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Other potential threats include plastic debris ingestion (and associated gut-blockage) and ship strikes. 0000001684 00000 n
At least in,The contribute of some rostral cervical nerves to the plexus would represent a topographical difference with terrestrial mammals, perhaps due to the shortness of the cetacean cervical spine (and to the virtual absence of an external neck).
The innervation of the,The absence of the pelvic limb restricts the scope of the lumbo-sacral plexus. trailer
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Beached dwarf sperm whale in Bali reportedly chopped up for meat & oil by locals . xref
0000013979 00000 n 0000002882 00000 n to 600 lbs. 0000028884 00000 n
The small dorsal fin (< 5% of the body length) is usually set well behind the midpoint of the back. 0000035648 00000 n
This species appears to prefer somewhat more temperate waters than does the dwarf sperm whale. 0000002112 00000 n Dwarf sperm whales prefer warmer tropical climates and are most commonly found in the waters of the continental shelf. 0000005366 00000 n As a result, scientists rarely see dwarf sperm whales at sea. Where do dwarf sperm whales live? 0000009068 00000 n 0000032246 00000 n
Almost nothing is known of the behavior and ecology of this species, other than what has been learned from brief sightings during research cruises.
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They are quite robust, and are not as streamlined as most other odontocetes.
0000004056 00000 n The dwarf sperm whale may have anywhere from 16 – 24 teeth on its lower jaw and up to 6 teeth on the upper jaw…
There are no estimates of global abundance, but there are thought to be at least 3,000 of them off California.A close-up view of a stranded pygmy sperm whale, showing the blunt head, underslung lower jaw, fang-like teeth, and small eye. 0000004727 00000 n 0000036266 00000 n
There are usually no teeth in the upper jaw.Adult pygmy sperm whales are 2.7–3.8 m long. 0000001329 00000 n
<. They are generally not commonly seen alive at sea, but they are among the most frequently-stranded small whales in some areas.
They have a bluish gray coloring with a lighter colored under body. 0000029222 00000 n %PDF-1.4 %���� 0000001422 00000 n
Matthias Ang | June 22, 2020, 04:09 PM . Very little is known of the reproductive biology of the pygmy sperm whale. Nerves bound to the muscles of the forearm are extremely reduced due to the diminished importance of the whole muscular system distal to the arm (,Ventral divisions of the thoracic and lumbar nerves reach the muscular walls of the thorax and abdominal sector.
0000003464 00000 n When seen at sea, they usually appear slow and sluggish, and often raft montionless at the surface with no visible blow.
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