the Whale on my profile pic, is named Windrose. Humpback Whales, (Megaptera novaeangliae) have a unique pattern on the underside of their tail It's like a Only one patter per whale.
So, marine biologists track the whales, and keep records. Miss Windrose, became a Great-Grandmother last summer. Her grand daughter was seen not far from me, with a baby calf, last year.

I took the pic from my boat, as you can see, the whales congregate near to our shores.