Tuesday, 23 October 2012

Undersea World


Singapore Post Ltd  issued a  stamp series of four stamps  feature marine mammals of undersea world, such as the Indo-Pacific Bottlenose Dolphin,  the Indo - Pacific Humpback Dolphin, Finless Porpoise, and Dugongs on March 22, 2006.


Indo- Pacific Bottlenose Dolphin
The Indo-Pacific Bottlenose Dolphins , also known as Tursiops aduncus, and normally found in warm and temperate seas worldwide. It is named bottlenose due to the animal having a short rounded snout or ‘beak’ that looks like a bottle.
 
 The Indo-Pacific  Bottlenose  Dolphins  is  one  of the most popular types    of   bottlenose   dolphins    in   the   world.    Their   size   are  approximately 8 ½ feet in length  and weigh up to  500 pounds. Other appearances    are    either   dark   gray  or   black  in   color   and   the underside  of  the   belly  is  often  a dark  white or a  lighter  shade of gray. They are long  and  sleek  in  their  body  design  so  they have a great freedom of movement.

The biggest part of the diet for these dolphins are fish and squid. They hunt at night time and have great techniques for getting large amounts of food to come to them. Then they work together to make a tight circle around it before consuming their prey. They will also consume crustaceans if necessary due to the fact that they eat large amounts of food daily.


Indo-Pacific Humpbacked Dolphin

The Indo-Pacific humpback dolphin, also known as Chinese white dolphin, Sousa chinensis chinensis is a humpback dolphin species, one of 80 cetacean species. These dolphins inhabit the waters of Southeast Asia and breed from South Africa to Australia.

The body length is 2 to 3.5 m  for adults and 1 m  for infants. An adult weighs 150 to 230 kg . Chinese white dolphins live up to 40 years. Chinese white dolphins rise to the water surface to breathe every 20 to 30 seconds and after that, they will dive into deep water again.

Chinese white dolphins are sociable creatures and live in groups of three to four. Female white dolphins become mature at 10 years old, while the males become mature at 13 years old. They usually mate from the end of summer to autumn.


Finless Porpoise

The Finless porpoise, also known as  Neophocaena phocaenoides is one of six porpoise species which have appearance almost completely lacks a dorsal fin. Instead there is a low ridge covered in thick denticulated skin.

The finless porpoise lives in the coastal waters of Asia, especially around Korea, India, China, Indonesia, Bangladesh and Japan.
Adults of the finless porpoise are a uniform, light grey colour. Adults grow more than 1.55 m  in length and up to 30–45 kg  in weight. Males become sexually mature at around four to six years of age, and females at around six to 9 years of age.



  
 

Dugongs

Dugongs are large grey mammals which spend their entire lives in the sea. Fully grown, they may be three metres long and weigh 400 kilograms.

The dugong is the only strictly-marine herbivorous mammal. These enormous vegetarians can be found in warm coastal waters from East Africa to Australia, including the Red Sea, Indian Ocean, and Pacific.
Dugongs spend much of their time alone or in pairs, though they are sometimes seen gathered in large herds of a hundred animals.  

Dugongs swim by moving their broad whale-like tail in an up and down motion, and by use of their two flippers. They come to the surface to breathe through nostrils near the top of their snouts. Dugongs' only hairs are the bristles near the mouth.

Dugongs graze on underwater grasses day and night, rooting for them with their bristled, sensitive snouts and chomping them with their rough lips. Dugongs reach adult size between 4 and 17 years of age. These low breeding rates, long-term care of their calves, long time between calves, as well as their dependence on seagrass, make dugongs vulnerable to human threats.

Dugongs are now legally protected throughout their range, but their populations are still in a tenuous state. These languid animals make an easy target for coastal hunters, and they were long sought for their meat, oil, skin, bones, and teeth.






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