Echlocation
Echolocation - All
dolphins can
see, however as visibility is restricted underwater they have developed the use of a sonar system called
'echolocation' to find
food when navigating and hunting for food. Their clicks make
high-frequency sounds, and the echoes of these sounds bounce back
which enables them to make a mental map. Using this mental map
they are able to avoid the smallest of obstacles whilst locating
their prey. In just a split second Echlocation enables them to
determine the size of objects, their location, how fast they are
Differences between the Dolphin and
the Porpoise
The
Dolphin and the Porpoise are two different types of mammals:
- Dolphins are
larger, more streamlined and acrobatic
- Porpoises
are smaller and stockier with triangular dorsal fins or no
dorsal fins at all
- The dolphin
dorsal fin is larger and more curved
- Dolphins
have a 'beak'
- Porpoises
are 'beakless', with a rounded snout
- Dolphins
travel in larger groups than porpoises
- Dolphins
produce sounds that humans can hear
- Porpoises
communicate at frequencies beyond the range of human hearing
Species of Dolphins
There
are thirty-eight different species of Dolphins which can be
divided into three categories of Humpbacked, Ocean and River
dolphins examples of which include the following:
- Common
dolphin
- Delphinus
delphis (short-beaked)
- Delphinus
capensis (long-beaked)
- Humpbacked
Dolphins
- Sousa
teuszii - Atlantic Humpbacked Dolphin
- Sousa
chinensis - Indo-Pacific Humpbacked
- Ocean
Dolphins
- Stenella
frontalis - Atlantic Spotted Dolphin
- Tursiops
truncatus - Bottlenose
- Cephalorhynchus eutropia - Chilean
- Lagenorhynchus cruciger - Hourglass
- Lagenorhynchus obliquidens - Pacific White-Sided Dolphin
- Stenella
attenuata - Pantropical Spotted Dolphin
- Steno
bredanensis - Rough-Toothed Dolphin
- Stenella
longirostris - Spinner
- Stenella
coeruleoalba - Striped Dolphin
- River
Dolphins
- Lipotes
vexillifer - Baiji - Chinese River Dolphin
- Inia
geoffrensis - Boto - Amazon River Dolphin
- Pontoporia
blainvillei - Franciscana - La Plata River Dolphin
- Platanista
minor - Indus River Dolphin
Facts about where Dolphins live and what they eat!
Dolphins are native to all of the World's
Oceans and Seas. They can also be found in some large river
systems as indicated above by their species names
Dolphins are carnivores and their diets vary according to their
habitat but commonly consist of either fish or squid, octopus,
cuttlefish, crabs, shrimps and lobsters.
Basic Facts about Dolphins
The name of a male is referred to
simply as a male
The name of a female is referred to simply as a female
The name or offspring, or a baby Dolphins, is a calf
The average size of a litter is one
The collective name for a group of Dolphins is a pod
The sound made by a Dolphins is referred to as a click or a
whistle
Facts about the Size of Male
Dolphins
Killer whales are the largest
species of dolphin and can grow to 9.8 m and weigh up to
9,000-to-10,000 kg.
Facts about the life, behavior
and personality of Dolphins
- They have their own signature
whistle which distinguishes them from other dolphins!
- Groups form strong alliances in
their pods
- A baby dolphin learns to 'speak'
and hunt from its parents
Cool and Fun Facts about Dolphins
Some
fascinating information & facts about Dolphins - find our
what a Pod, a Rostrum, a Melon, Blubber, Flukes and Blowholes are!
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