Bellow

A bellow was a guttural vocalization made by various animals. It was a loud and deep noise.

In 3188, a herd of trance worms on Sanctuary Four were bellowing during their breeding cycle. (DIS: "That Hope Is You, Part 1")

This vocalization was identified in the closed captioning for the episode.
In the real world, animals who bellow during mating do so for attracting mates and for intimidating their rivals.
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