How do dolphins communicate?
Just like dogs, cats, and other mammals by using
sound, vision, touch, and taste. Dolphins don't have
the ability to smell, however. Scientists do not think
that dolphins have a language like humans. Each dolphin
can make a unique signature whistle that may help
individual dolphins recognize each other, but it may
just help a dolphin know that some other dolphin is
nearby. Scientists don't know for sure.
How intelligent are dolphins?
We don't know because no one has given them an intelligence
test! Most scientists believe that dolphins are on
a level with chimpanzees and dogs. Dolphins can learn
to perform certain actions. They learn best when actions
are broken into small steps and they are given food or other
Do dolphins have families?
The structure of dolphin groups (also called herds
or pods) is more like that of elephants than humans.
In killer whales the social group is formed by a female
and her calves even if they have grown to adults.
The fathers of the calves do not live with the pod.
We do not know what the social structure is for many
kinds of dolphins.
What is echolocation?
Echolocation is a way of using sound to find objects
in the environment. Bats use it in the air and dolphins
use it in the water.
To echolocate, the dolphin generates a sound pulse (of clicks) in its forehead which is
sent into the water. The sound bounces off objects,
creating an echo that returns to the dolphins. We think
that dolphins hear the returning echoes by feeling
the sound pulses against their jaws. Different objects
(like different kinds of fish) give off different kinds
of echoes. Dolphins can also judge how far away the object is by the amount of time it takes for the echo to return.
Are all dolphins endangered?
No, all dolphins are not endangered. Neither the bottlenose
dolphin nor the killer whale are endangered. However,
several of the river dolphins are very endangered because
humans have destroyed their habitat. If we humans don't
take care of the earth, many more species of dolphins
will become endangered in the future.
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