User blog comment:Kogath/Monster Hunter X Discussion/@comment-4969421-20151127233252/@comment-5569775-20151128095321

Not: It has a mouth, that's where the roars come from. It's hard to see at times, but just watch the front of it when it lifts up to roar, it was especially noticeable around the time it went into rage. Interestingly enough, it shakes the tentacles around to make it look like they're the ones roaring.