A look at the many forms of cetacean life living in the worlds waters

Marine life essay

Some whales have smooth skin; others are covered in bumpy growths and callouses. Porpoises The porpoises, seven species in all, are distinguished from dolphins by their stubbier beaks and flatter teeth. Enjoy this video made by Sweet Fern Productions showing the stages of a whale fall. Canada stopped all commercial whaling in as a conservation measure, at the time, large whales were threatened almost everywhere in the world. It is like trying to find a needle in a haystack, as we like to say. Catzeflis, E. In whales, a layer of the skin dermis has evolved into a blanket of blubber , which is extremely rich in fats and oils and therefore conducts heat poorly. Smell The sense of smell can be defined as those sensations carried from nose to brain by the olfactory nerve. Regardless, dolphins have been shown to be sensitive to the standard four qualities of taste: sweet, salty, sour, and bitter. Cetacean evolution has countered this problem in three ways: reducing external appendages that lose heat, developing an insulating layer of blubber, and developing countercurrent circulation to minimize heat loss. Nikaido, M. The stomach in cetaceans is composed of four compartments: forestomach, main stomach, connecting chambers, and pyloric stomach. Photo-identification catalogues can include hundreds or even thousands of individuals and names are so much easier to remember than numbers! The reduction of various appendages as mentioned above also facilitates locomotion in water. Nikaido, H.

If you are fascinated with this type of creature then you should take the time to do more research. Family life Looking after baby Whales, dolphins and porpoises are born already able to swim, with fully formed vision and hearing.

cetaceans

Microbes are responsible for virtually all the photosynthesis that occurs in the ocean, as well as the cycling of carbonnitrogenphosphorus and other nutrients and trace elements.

And their worlds are dark and quiet. Many people confuse whales with dolphins, and what is even more complicated with that is that they really are in many ways. Cetacean evolution has countered this problem in three ways: reducing external appendages that lose heat, developing an insulating layer of blubber, and developing countercurrent circulation to minimize heat loss.

Goto, I.

Whale that looks like a dolphin

Companionship To give the well-known phrase a twist, no whale or dolphin is an island. This has become quite a popular sport due to the magnificent size of these creates. Due to a combination of these scenarios, many species of whales are endangered. Back to the water There are many mammals that spend time in the water. For many whales and dolphins, mothers and youngsters continue to stay close together long after the important early-life connection period. Fordyce, M. Some are black or dark grey, others are white, some are pink, one is blue and most are multi-coloured. Toothed Whales Another way you can tell them apart is by the number of blowholes a whale has. The sound sensitivity of dolphins falls off near the bottom of the human acoustic spectrum 40—50 hertz , but this is the beginning of the range used by the large baleen whales. This phase can last as short as several months to as long as two years. Photo-identification catalogues can include hundreds or even thousands of individuals and names are so much easier to remember than numbers!

For this reason, veterinarians had to perfect respirators before dolphins could be successfully anesthetized.

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List of cetacean species