Turns out that whale's tails are all different, they are like our human finger prints. The naturalist said there is a website where you can try to identify your whales tails. I have not checked it out.
TFL
Used the following by Anna Aspnes
WaterColor template album #7 - https://www.oscraps.com/shop/WaterColor-Template-Album-No.-7.html
ArtPlay palette Fernweh - https://www.oscraps.com/shop/ArtPlay-Palette-Fernweh.html