A roar is a type of animal vocalization consisting of both a low fundamental frequency (pitch) and low formant frequency. Mammals of various species don the ability to produce roars and other roar-like manners of vocalizing. These include lions, tigers, leopards, jaguars, gorillas, elephants, some ungulates, some bovids, howler monkeys, bears, red deer, some pinnepids and hammer-headed bats. The ability to roar has an anatomical basis, often involving modifications to the larynx and hyoid bone and enlarged internal air spaces for low-frequency acoustic resonance. While roaring, animals may stretch out their necks and elevate their heads to increase the space for resonance. Though usually airborne, some roars are emitted underwater, as in the case of the male harbor seal.
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