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صور من الحيتان الضخمة Marine Mammals- Sovereigns Of The Oceans

صور من الحيتان الضخمة Marine Mammals- Sovereigns Of The Oceans Report email Full view

‏من جهاز الـ iPhone الخاص بي Marine Mammals- Sovereigns Of The Oceans ٢٦ يناير ٢٠١٢coloredwall.com Whale is the common name for variousmarine mammals of the order Cetacea. الساعات The term whale sometimes refers to all cetaceans, but more often it excludes dolphins and porpoises, which belong to suborder Odontoceti (toothed whales). نسخة الساعات السويسرية This suborder also includes the sperm whale, killer whale, pilot whale, and beluga whale. نسخة الساعات The other Cetacean suborder Mysticeti (baleen whales) are filter feeders that eat small organisms caught by straining seawater through a comblike structure found in the mouth called baleen. نسخة الساعات This suborder includes the blue whale, the humpback whale, the bow-head whale and the minke whale. الساعات وهمية All Cetacea have forelimbs modified as fins, a tail with horizontal flukes, and nasal openings (blowholes) on top of the head. ساعات كارتييه All cetaceans, including whales, dolphins and porpoises, are descendants of land-living mammals of the Artiodactyl order. Both are related to the Indohyus from which they split around 54 million years ago. Like all mammals, whales breathe air, are warm-blooded, nurse their young with milk from mammary glands, and have body hair.Whales range in size from the blue whale, the largest animal known to have ever existed at 30 m (98 ft) and 180 tonnes (180 long tons; 200 short tons), to various pygmy species, such as the pygmy sperm whaleat 3.5 m (11 ft). Whales collectively inhabit all the world's oceans and number in the millions, with annual population growth rate estimates for various species ranging from 3% to 13%. For centuries, whales have been hunted for meat and as a source of raw materials. By the middle of the 20th century, however, industrial whaling had left many species seriously endangered, leading to the end of whaling in all but a few countries. Whales are generally classed as predators, but their food ranges from microscopic plankton to very large animals. Toothed whales eat fish and squid which they hunt by use of echolocation. Orcas sometimes eat other marine mammals, including whales. Baleen whales such as humpbacks and blues feed only in arctic waters, eating mostly krill. They imbibe enormous amounts of seawater which they expel through their baleen plates. The water is then expelled and the krill is retained on the plates and then swallowed. Whales do not drink seawater but indirectly extract water from their food by metabolizing fat. Many whales are very acrobatic, even breaching (jumping) high out of the water and then slapping the water as they come back down. Sometimes they twirl around while breaching. Breaching may be purely for play or may be used to loosen skin parasites or have some social meaning.Spyhopping is another cetacean activity in which the whale pokes its head out of the water and turns around, perhaps to take a look around. Some whales stick their tail out of the water into the air, swing it around, and then slap it on the water's surface; this is called lob-tailing. It makes a very loud sound. Logging is when a whale lies still at the surface of the water, resting, with its tail hanging down. While floating motionless, part of the head, the dorsal fin or parts of the back are exposed at the surface. Many ceteaceans, especially baleen whales, migrate over very long distances each year. They travel, sometimes in groups (pods), from cold-water feeding grounds to warm-water breeding grounds. Cetaceans have very strong social ties. The strongest social ties are between mother and calf. A social group of whales is called a pod. Cetaceans give birth to live young which are nourished with milk from their mothers - they don't lay eggs. Cetaceans breed seasonally, usually in warm tropical waters, and females usually have one calf every 1-3 years. The gestation times range from 9-18 months. Whale calves can swim at or soon after birth. Mother whales care for their young for an extended period of time, usually at least a year, feeding them milk and protecting them. Complex whales songs can be heard for miles under the water. The humpback's song can last for 30 minutes. Baleen whales sing low-frequency songs; toothed whales emit whistles and clicks that they use for echolocation. The songs are thought to be used in attracting mates, to keep track of offspring, and for the toothed whales, to locate prey.

‏من جهاز الـ iPhone الخاص بي Marine Mammals- Sovereigns Of The Oceans ٢٦ يناير ٢٠١٢coloredwall.com Whale is the common name for variousmarine mammals of the order Cetacea. The term whale sometimes refers to all cetaceans, but more often it excludes dolphins and porpoises, which belong to suborder Odontoceti (toothed whales). This suborder also includes the sperm whale, killer whale, pilot whale, and beluga whale. The other Cetacean suborder Mysticeti (baleen whales) are filter feeders that eat small organisms caught by straining seawater through a comblike structure found in the mouth called baleen. This suborder includes the blue whale, the humpback whale, the bow-head whale and the minke whale. All Cetacea have forelimbs modified as fins, a tail with horizontal flukes, and nasal openings (blowholes) on top of the head. All cetaceans, including whales, dolphins and porpoises, are descendants of land-living mammals of the Artiodactyl order. Both are related to the Indohyus from which they split around 54 million years ago. Like all mammals, whales breathe air, are warm-blooded, nurse their young with milk from mammary glands, and have body hair.Whales range in size from the blue whale, the largest animal known to have ever existed at 30 m (98 ft) and 180 tonnes (180 long tons; 200 short tons), to various pygmy species, such as the pygmy sperm whaleat 3.5 m (11 ft). Whales collectively inhabit all the world's oceans and number in the millions, with annual population growth rate estimates for various species ranging from 3% to 13%. For centuries, whales have been hunted for meat and as a source of raw materials. By the middle of the 20th century, however, industrial whaling had left many species seriously endangered, leading to the end of whaling in all but a few countries. Whales are generally classed as predators, but their food ranges from microscopic plankton to very large animals. Toothed whales eat fish and squid which they hunt by use of echolocation. Orcas sometimes eat other marine mammals, including whales. Baleen whales such as humpbacks and blues feed only in arctic waters, eating mostly krill. They imbibe enormous amounts of seawater which they expel through their baleen plates. The water is then expelled and the krill is retained on the plates and then swallowed. Whales do not drink seawater but indirectly extract water from their food by metabolizing fat. Many whales are very acrobatic, even breaching (jumping) high out of the water and then slapping the water as they come back down. Sometimes they twirl around while breaching. Breaching may be purely for play or may be used to loosen skin parasites or have some social meaning.Spyhopping is another cetacean activity in which the whale pokes its head out of the water and turns around, perhaps to take a look around. Some whales stick their tail out of the water into the air, swing it around, and then slap it on the water's surface; this is called lob-tailing. It makes a very loud sound. Logging is when a whale lies still at the surface of the water, resting, with its tail hanging down. While floating motionless, part of the head, the dorsal fin or parts of the back are exposed at the surface. Many ceteaceans, especially baleen whales, migrate over very long distances each year. They travel, sometimes in groups (pods), from cold-water feeding grounds to warm-water breeding grounds. Cetaceans have very strong social ties. The strongest social ties are between mother and calf. A social group of whales is called a pod. Cetaceans give birth to live young which are nourished with milk from their mothers - they don't lay eggs. Cetaceans breed seasonally, usually in warm tropical waters, and females usually have one calf every 1-3 years. The gestation times range from 9-18 months. Whale calves can swim at or soon after birth. Mother whales care for their young for an extended period of time, usually at least a year, feeding them milk and protecting them. Complex whales songs can be heard for miles under the water. The humpback's song can last for 30 minutes. Baleen whales sing low-frequency songs; toothed whales emit whistles and clicks that they use for echolocation. The songs are thought to be used in attracting mates, to keep track of offspring, and for the toothed whales, to locate prey.


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