Conservation - sea
Bds Conservation - sea
Conservation - land
Bds Conservation - land
Green Expo 2006
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CARIBBEAN - conservation
Whales, the largest animals on earth, belong to a family of mammals known as cetaceans. Unlike fish, whales are warm-blooded, breathe air and give birth to live young. Scientists believe that they evolved from land mammals with four legs, though they are now supremely adapted to underwater life. They have excellent hearing and are two to three times more efficient than land mammals at using oxygen in inhaled air. Whales have collapsible ribcages which assist them with deep diving, and they have layers of insulating fat, called blubber, to protect them from the cold.
Since it is very difficult to count whales accurately and population changes occur very slowly, it is impossible to tell if a population is growing or shrinking in the course of a few years' study. In fact, the size of some populations of whales is known no more accurately than plus or minus 50 percent.
What is known, however, is that whales can be found in all oceans of the world, and under the right circumstances, they can be seen from almost any coastal country. Whale watching has become a popular pastime in more than 87 countries,- the unique behaviours and characteristics exhibited by whales make them fascinating to observe in the wild.
Quick facts about whales:
There are two main types of whales: toothed whales and
baleen whales. Toothed whales include the Sperm whale and many small species
such as the Narwhal and Beluga. The others are baleen whales, which have
hundreds of comb-like plates made up of stiff hairs instead of teeth.
These form a sieve that filters food out of the seawater.
Whales have mammary glands with which they feed their
young. A Southern Right whale calf can drink up to 200 litres of milk
Information compliments of http://whales.greenpeace.org/whales/index.html
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