General Description of
the Blue Whale
Welcome to the Blue
Whale information website. This site is dedicated to knowledge
and conservation of the Blue whale, which is the largest &
loudest animal that ever lived on planet Earth. These enormous
mammals eat tiny organisms, like plankton and krill, which they
sieve through baleen, the filters that are in place of their
teeth. They live in small groups called 'pods.'
Instead of a single
blowhole like Killer whales and Dophins, blue whales have 2
blowholes on top, and a 2-14 inch (5-30 cm) thick layer of
blubber to keep them warm. (Depending on the time of year.) The
blue whale's skin is usually blue-gray with white-gray spots.
The underbelly has brown, yellow, or gray specks. During the
winter in cold waters, diatoms, a microscopic, single-celled
algae, stick to the underbelly, giving it a yellow to silver-
to sulfur-colored sheen; they are sometimes called "sulfur
They have a very
small, falcate (sickle-shaped) dorsal fin that is located near
the tail. Blue whales have long, thin pectoral flippers 8 feet
long (2.4 m) and flukes (the tail fins) that are about 25 feet
(7.6 m) wide.
Blue whales are
found throughout the world's oceans. They are rorqual whales,
which means whales that have pleated throat grooves that allow
their throat to expand during the huge intake of water during
filter feeding. Blue whales have 50-70 throat grooves that run
from the throat to mid-body, so that when they take in seawater
& Krill to filter out, they have a large capacity that
helps them gather a full stomach in a short amount of time.
Below is a picture of a blue whale feeding, with its' throat
expanded & filtering out the water.
Blue whales are an overall blue-gray color,
mottled with light gray. Cold water diatoms, a microscopic,
single-celled algae, adhere to their skin and sometimes give
their bellies a yellowish tinge, that has earned the blue whale
its nickname of "sulfur bottom." Blue whales are long and
streamlined. Their dorsal fins are extremely small, and their
pectoral flippers (the two big ones on the sides) are long and
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