SMALL WHALES
Dolphins and porpoises, often called simply "small whales," are mammals, not
fish, and are thus warm-blooded, keeping their body temperature nearly constant
even when they are exposed to different environmental temperatures. The mothers
provide milk for the young for a year or more. Like other whales, dolphins have lungs
and breathe through a single nostril, called the blowhole, located on top of the head.
The blowhole is opened during their frequent trips to the surface to breathe. In
contrast to some of the large whales, dolphins and porpoises have teeth, which they
use to seize their food, consisting primarily of marine fish. Certain species of marine
dolphins are the best-known biologically because they survive well in captivity, which
means they can be more carefully observed. The bottle-nosed dolphin has been the
most intensively studied because of its adaptability to salt-water holding tanks. It is a
major participant in acrobatic shows at oceanariums and is noted for its curiosity
toward humans.
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