Orcas / Killer Whale Facts and Adaptations
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- reality span: 35-50 years Breeding: sensual maturity: 12-16 term males / 6-10 years females, Gestation: 12-16 months, Birth length: two - 2.5m (6-9ft), Birth weight: 180kg (300lbs) lounge duration: twenty mins Feeding: small is perceive of the diet, different populations seem to have particular favoured prey, in Antarctica, seals, minke whales, fish and squid are taken, one group known as Type-C are thought to feed exclusively on fish Distribution: same in all oceans recent nature population: up to 100,000, the dominance (70,000) in Antarctica.
- After this, whether they guessed the match insignificant, or whether they missed Ponting is uncertain, but the terrifying creatures passed on to other hunting grounds, and we were able to rescue the dogs, and what was even more important, our petrol - five or six tons of which was waiting on a piece of ice which was not split away from the main mass.
- Of course, we have understood well that killer whales continually skirt the edge of the floes and that they would undoubtedly snap up anyone who was unlucky plenty to fall into the water ; but the matter that they could display such purposeful cunning, that they were capable to grind nature of such thickness (at least two 1/2 feet), and that they could act in unison, were a revelation to us.
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butcher Whales / Orcas Facts and Adaptations Orcinus orca Orcas, Sea wolves, Blackfish, Grampus. One of the worlds most formidable predators, all the more so as they hunt in packs, Orcas are toothed whales related to dolphins. Orcas / drug whales, facts - Basics Killer whales / Orca sewing off the coast of Alaska ultimate length: 9.8m (32.2ft) youngster / 8.5m (27.9ft) females Adult weight: males: 11.1 tonnes max. / females 8.3 tonnes max. reality span: 35-50 years Breeding: sensual maturity: 12-16 term males / 6-10 years females, Gestation: 12-16 months, Birth length: two - 2.5m (6-9ft), Birth weight: 180kg (300lbs) lounge duration: twenty mins Feeding: small is perceive of the diet, different populations seem to have particular favoured prey, in Antarctica, seals, minke whales, fish and squid are taken, one group known as Type-C are thought to feed exclusively on fish Distribution: same in all oceans recent nature population: up to 100,000, the dominance (70,000) in Antarctica. Orcas werent targeted by whalers, threats are from interactions with fisheries and pollution . Not particularly abundant anywhere in its range. preservation status: deficient data , as huge carnivores they have a keen intelligence that enables them to be recited in captivity to do various tricks for rewards and so have been kept in marine aquariums and Sea-World type exhibits for many years. They are easily identified with their distinctive black and white patterning. butcher whales are stout in appearance read to most whales which are quite long and slim relative to their length . gentleman are significantly enormous than females (a trait appreciated as sexual dimorphism) and have a huge and eminent dorsal fin (the one in the middle of their back) that include reach six ft (1.8m) in height, the females dorsal fin is usually less than half this height. They are Odontocetes or toothed whales and while they are quite little read to the great baleen whales (Mysticetes) they are at the very top of the Antarctic food chain due partly to their formidable array of teeth, but most of all due to the fact that they often hunt in packs or pods. Their tastes are wide ranging from krill, squid, fish and sharks to penguins, seals and even the much larger baleen whales. Orcas are the vast of all carnivores on earth that feed on a wide variety of foods, they are located in almost all oceans, from the tropics to the Arctic and Antarctic where they will go deep into the pack-ice to hunt seals and penguins. They are commonest in coastal waters and in cool temperate and sub polar seas. They have very blunt strong conical shaped teeth, from 40-48 with equal digit in each side of the upper and lower jaws. The spike check be up to 5cm (2 ) long. When a pod of killer whales is feeding, they urge co-ordinate their movements by a constant stream of clicks and calls, though becoming silent in the final approach to intelligent prey such as seals. Ever ready to spot an opportunity, killer whales will even follow ice-breakers at the start of the season as they cut paths through the ice to reach deeper into the ice and perhaps get to seals and penguins that were beyond their reach. A male killer whale at the rear showing the charcteristic much larger dorsal fin compared to the female in the foreground. So audacious and opportunistic are killer whales in this respect , that organization of killer whales are guessed to have spent an whole winter living in and around a polynya, an area of open water kept clear by currents and winds while surrounded by miles of closed ice. These killers were unable to return to the open ocean as they would have had to have held their breath under the continuous pack ice for longer than they were able. In the course of financial whaling, while Orcas werent very plenty hunted themselves (they were much too small a catch to waste an expensive harpoon on), they would often follow the whaling boats and rush at the dead baleen whales that were being flensed or towed alongside the boat ready for flensing and feed on the carcass. As such, they were plenty disliked by the whalers as they competed for the prey that they had just captured. Not for nothing are these whales called the wolves of the sea. Ecology and behaviour Killer whales are very social animals maintaining in family groups that are determined by the females of the group, so-called tribal groups. They shape the most steady family groups of any animal species. Different groups have specific hunting techniques and even vocalizations that are passed down over many generations. It is likely, though not yet proven that there is actually more than one species of killer whale, so distinct are different populations. butcher whales swimming in McMurdo Sound Antarctica - Photo Donald LeRoi, NOAA Southwest Fisheries Science Center, racial Science Foundation An exciting expression of the ecology of Orcas located from studies of populations off Washington state in the USA and up to Alaska is there are three distinct types that are very similar but differ somewhat in coloration in morphology (the way they look / proportions etc.) but most of all in their behaviour. These three types are known as Residents, Transients and Offshore, they are discrete populations and little or no mixing between them appears to take place. citizen - These stop in one location all through their lives and form very steady communities. They keep to be mainly fish eaters which they are thought to catch with the help of echolocation. Their dorsal fins are more rounded at the top compared to the transients that have more pointed dorsal fins. Transients - lose around more, they tend to feed on marine mammals, mainly seals. They form pods with less members than residents and are not so loyal to a particular pod. Offshore - The negligible of all is understood about these (as they live mainly offshore) but they form large pods and move following the edge of the continental shelves. Though these community have only been examined to any depth in the North Western United States, explanation are that the behavioural types persist elsewhere too such as the Type C population found in Antarctica. prototype C Orcas, indicated by the sloping white patch near the eye, this is a calf with an elder individual, probably the mother behind it. prototype Cs are a population that live in the Ross Sea in Antarctica, they are guessed to feed almost exclusively on Antarctic cod. In the immediate foreground is a non-native Antartic species getting a whale selfie. countless Orcas feed on a large range of prey. More or lower - if they seek it and catch it, theyll at slightest have a go at eating it. several pot of Orcas seem to have various specialties of diet and will specialize in a particular type of prey developing and becoming skilled in the ways to capture that prey. For illustration they have been seen: Co-operatively herding fish such as herring together into slim groups and then thumping them with their tails to stun them. Otherwise a herring would be a lot of effort and a small mouth-full for such a large animal. astonishing youthful and unwary sea wonder off the coast of Patagonia by chasing after them right into the shallows and then lunging with a great snap of their powerful jaws. Returning to sea after a near stranding in these cases takes quite an effort for the whale. assailing the important baleen whales such as blue whale by tearing at and eating the great tongue which itself can be the size of an African elephant. A pod of 40 or so Orcas have been seen engaging in this behaviour attacking a solitary huge adult blue off the coast of California. grinding through sea icy from below to surprise seals and penguins, or seeing them on ice-floes and then pushing upwards on the floe to tip the prey into the water. Alternatively two whales may rush at an ice floe which is then washed over by a large wave which dislodge the seal or penguin. drug whales are often approachable by boats and are generally inquisitive. They are frequently active at the surface showing such behaviours as lobtailing, flipper-slapping, spyhopping, wave riding and breaching. scraping against a hard crust such as rocks or even other whales is often seen. It is supposed to serve as a relaxation movement and helps to remove blind skin. Certain rock rubbing areas may be socially important. Like all whales, sound is very critical to killer whales. Researchers have even identified unique sounds and discrete calls that are distinctive to certain pods and family groups, to the extent that killer whale dialects can be identified. I was a small late on the picture this morning, and thereby testified a most extraordinary scene. Some six or seven killer whales, obsolete and young, were evading the fast floe knife ahead of the ship; they seemed elated and dived rapidly, almost inspiring the floe. As we watched, they suddenly arrived astern, raising their mouth out of water. I had apprehended horrible tale of these beasts, but had never associated serious danger with them. adjacent to the waters line shed the wire stern rope of the ship, and our two Esquimaux pup were tethered to this. I did not guess of connecting the motion of the whales with this fact, and seeing them so adjacent I shouted to Ponting, who was standing abreast of the ship. He snatched his camera and ran towards the floe edge to get a narrow picture of the beasts, which had momentarily disappeared. The next minute the complete floe under him and the dogs vomit up and split into fragments. One could hear the booming rattle as the whales rose under the ice and struck it with their backs. Whale after whale grew under the ice, setting it rocking fiercely; luckily Ponting observed his tail and was capable to fly to security. By an remarkable place also, the splits had been run around and between the dogs, so that neither of them fell into the water. Then it was clean that the whales combint our astonishment, for one after another their large hideous heads shot vertically into the air through the cracks which they had made. As they raised them to a height of six or eight meter it was probable to imagine their tawny head markings, their little glistening eyes, and their horrible array of spike - by far the largest and most terrifying in the world. There cannot be a question that they admired up to see what had happened to Ponting and the dogs. The latter were horribly terrified and weakened to their chains, whining; the mind of one killer postulate certainly have been within five feet of one of the dogs. After this, whether they guessed the match insignificant, or whether they missed Ponting is uncertain, but the terrifying creatures passed on to other hunting grounds, and we were able to rescue the dogs, and what was even more important, our petrol - five or six tons of which was waiting on a piece of ice which was not split away from the main mass. Of course, we have understood well that killer whales continually skirt the edge of the floes and that they would undoubtedly snap up anyone who was unlucky plenty to fall into the water ; but the matter that they could display such purposeful cunning, that they were capable to grind nature of such thickness (at least two 1/2 feet), and that they could act in unison, were a revelation to us. It is clear that they are endowed with singular intelligence, and in future we shall treat that intelligence with every respect. Captain Robert Falcon Scott, January 5th 1911, from: Scotts final Expedition - The Journals of Captain R. F. Scott, R.N., C.V.O. Orcas or killer whales in Alaska picture courtesy Christopher Michel - Creative Commons Attribution 2.0 Generic lease All thing above courtesy NOAA unless otherwise spented
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