In Whale suggests the opposite, they are not whales.

In
the scientific world, the Orca is known taxonomically as the Orcinus orca. While the name Killer
Whale suggests the opposite, they are not whales. Orcas are a part of the
Delphinidae Family; they are a species of dolphin. These mammals are
carnivorous, known for hunting in groups of approximately forty called pods
which are often noted as similar to wolf hunting packs. They eat seals,
seabirds, sea lions, fish, and even whales. They have over forty teeth, each
approximately ten centimeters long in order to eat prey. These animals are the
largest in the dolphin family and can grow anywhere from twenty-three to
thirty-two feet long as well as weight up to six tons. They can be found in
various locations throughout the Earth from the arctic to equator, despite most
media representation depicting them in the wild to live in only arctic waters.

            Orcas are also considered quite
intelligent, which is one reason why they are often trained in captivity to
perform tricks. They have the largest brains out of all dolphins, weighing
between five and six kilograms. The Orca also has the ability to communicate
with other members of its species through echolocation, similar to Beluga
Whales who use this skill to find food and other members of its species. These
pods also seem to contain members of an extended family, and they have a
matriarchal system, as the female Orcas are known to protect their offspring as
well as other members of their pod. Female Orcas have offspring every three to
five years and go through seventeen-month pregnancies (Britannica and National
Geographic). 

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