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G
Gape: The mouthline of a cetacean.
Gulp feeding: A feeding technique performed by, mainly, roquals thrusting forward with open mouths and taking in a large quantity of prey.
H
Herd : A co-ordinated group of cetaceans (term is most often used when referring to baleen whales).
Homocercal Fin : A caudal fin with lobes of about the same size.
I
Infrasound: Sound produced below human hearing or 20 Hertz.
IWC: International Whaling Commission. An international body formed in 1946 to regulate whaling and conserve whale stocks
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