 Due to the low-frequency this sound produces, it only works to warn others if they are near by.This type of behaviour still works in its favor as the growl is also accompanied by body vibrations that the seahorse produces, which is likely to deter the predator when it is handling the seahorse.In Alligators (Alligator mississippiensis), a growl may be produced by females as a response to a "Headslap" display from males.