This is the sound of male humpback whales "singing", part of a breeding display.

Mighty is a male humpback whale who is an old friend of Father Bear's.

And so he thinks it is likely that male whales sing to one another.

Would we know if the male whale, the one who vocalized, did respond?

Somewhere near, the male whale had begun singing.

The male whale is known to sing for up to 22 hours at a time.

And here's something not a lot of people know: a testicle of a male whale weighs around 1,100 lbs.

My contribution to the field was discovering that only the male whales sing.

Indeed, many male whales bear the scars of competition from mating.