Cetaceans (whales, dolphins, porpoises) are separated into 2 suborders:

The Baleen Whales are defined by baleen, a sieve-like framework in the top jaw make of keratin, which they use to filter plankton native the water. They are the largest species of whale. The Toothed Whales who have actually teeth and prey top top fish, squid, or both.

The ax whale deserve to refer to every cetaceans, to simply the larger ones, or only to members of particular families in ~ the stimulate Cetacea. The term usually refers to every cetaceans that space not dolphin or porpoises. All whales, dolphins and porpoises room descendants that land-living mammals, most most likely of the Artriodactyl order . They gotten in the water roughly 50 million years ago.

Male whales are referred to as bulls, females are referred to as cows, and the young whales are referred to as calves.

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Behavior:

Whales cannot loss asleep for too long due to the fact that they require to mindful to breathe and stay alive. Just one hemisphere of your brains sleeps in ~ a time and it is believed that they sleep approximately eight hours a day; so, lock still gain the rest they need.

Whales communicated using lyrical sounds. They have actually been well-known to generate around 20,000 acoustic watts of sound at 163 decibels. Whales likewise have an extremely acute hearing v well occurred section of mind which administrate this function, which gives them progressed echo-location capacities analogous come sonar, like bats.

Reproduction:

Females offer birth come a solitary calf. Parenting time is lengthy (more 보다 one year in many species), which is connected with a solid bond between mother and also young. In most whales reproductive maturity occurs late, typically at 7 to ten years. This strategy that reproduction spawns few offspring, but provides each with a high price of survival. Most whales carry out not preserve fixed partnerships during mating; in many varieties the females have several mates each season. At birth the child is yielded tail-first, for this reason the hazard of drowning is minimized. Whale mother nurse the young by proactively squirting the fatty milk into their mouths, milk very comparable to cow"s milk. Biologists compare the consistency the whale milk to cottage cheese; it have to be thick, or else it will dissipate right into the surrounding water.

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Intelligence:

Whales have actually the largest brain of any kind of animal. The western people views whales as very intelligent animals. Whales have challenged no such eco-friendly stimuli to mind evolution. Whales live in one unchanging and also benign atmosphere with couple of natural predators. Their single adaptation to your marine environment has been increasing size. The whale"s lifestyle consists of swimming and also eating, tasks which fish perform perfectly competently v very tiny brains in relative term. From an evolutionary suggest of view, there is no factor for whales come have developed intelligence, due to the fact that their survival does not need them come perform any tasks for which intelligence is necessary.

Types of Whales:

Humpback Whale:

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http://www.photolib.noaa.gov

length of an adult: 40-50 feet Weight: 79,000 lbs interestingly enough, females have tendency to be larger in dimension than males. Location: Humpbacks deserve to be uncovered in all significant oceans

Minke Whale:

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www.ngo.grida.no/.../img/whale_minke.jpg

size of an adult: 22-24 feet Weight: 4-5 loads Gestation Period: 10 months, newborns nurse for five months. Minke Whales have the right to be spotted by their distinctive white tape on each flipper. Minkes live because that 30-50 years.

Fin Whale:

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http://www.pbs.org

size of one adult: 62-66 feet Weight: approximated as 154,000 lbs Gestation Period: 11 month to one year, newborns nurse because that up to seven months. Fin Whales with maturity between 25 and also 30 years and also have been known to live for approximately 94 years; however, females reach sex-related maturity in between 3 and also 12 years. Location: Fin Whales, prefer the Humpbacks, are found in every the world"s major oceans.

Blue Whale:

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http://www.wikipedia.org

size of one adult: 98 feet Weight: 100 loads believed to it is in the largest animal to have ever before lived on Earth. Blue Whales were hunted nearly to extinct in the at an early stage twentieth century. In 2002 a report approximated there to be 5,000 come 12,000 Blue Whales an international There have gone to least 11 documented situations of Blue/Fin Whale hybrid adults in the wild A Blue Whale"s tongue is around the dimension of an elephant. It"s approximated that about 50 adult humans can stand in that is mouth!