As you probably know, the underside of a humpback whale’s tail, or flukes, is the main characteristic used by scientists to identify individuals. In addition, a whale’s dorsal fin can also be used to distinguish individuals and/or help confirm a match. This is why, whenever possible, the research team aims at taking a photo-ID of the flukes as well as the left and right dorsal fins of each individual within a pod.
Dorsal fins vary in shape and form. Some are round, squared, pointy, even very hooked, which with a little bit of imagination, almost look like a witch’s nose. In some cases a dorsal fin might be scarred, for example from a propeller or fishing line, or even missing. Patterns and coloration of the skin on the body are also unique. So much that, occasionally, the conspicuous shape of the dorsal fin and/or the body patterns of an individual will attract your eye and stick in your memory. In those instances, you find yourself giving that particular individual a name that characterizes that special feature.