By Inc. Encyclopaedia Britannica
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Additional resources for Britannica Illustrated Science Library Mammals
They are sought for their high quantities of body oils, and they are relatively easy to capture. It is estimated that only 3,000 exist today. Hainan Black-crested Gibbon Nomascus nasutus sp. hainanus These primates are among the five species in most danger of extinction. Only 30 black-crested gibbons are known to exist. 5,416 20 Indonesia SOUTH AMERICA They live in the Andes Mountains of Chile and Peru. Indiscriminate hunting has decreased the species, and it is endangered. 60 0 EUROPE Sea Otter Once a continuous line of sea otter colonies stretched from the Kuril Islands of Japan to California.
Common Name Bottlenose dolphin Family Delphinidae Species Tursiops truncatus Adult Weight 330 to 1,400 pounds (150 to 650 kg) Longevity 30 to 40 years SPIRACLE 3 The lower mandible plays a very important role in the transmission of sounds to the inner ear. HAVING FUN Play for dolphins, as with other mammals, fulfills an essential role in the formation of social strata. 7 kg) The middle ear sends the message to the brain. Dolphins hear frequencies from 100 Hz up to 150 kHz (the human ear can hear only up to 15 kHz).
The sperm whale breathes oxygen into its body through spiracles located on the top of its head. Up to 60 feet (18 m) Muscle BLOOD An ample blood flow, rich in hemoglobin, transports elevated levels of oxygen to the body and brain. SPIRACLE 2 Spermaceti HEART The heart rate slows down during the dive, limiting oxygen consumption. Teeth They have 18 to 20 conical teeth, weighing up to 2 pounds (1 kg) apiece, in each lower mandible. COMPOSITION 90% Spermaceti Oil It is made up of esters and triglycerides.