The dolphin with the weird looking crescent mark also has a couple of nicks out of the dorsal fin. Dolphins with more than one identifying mark are really important. They help us figure out how long the nicks stay recognisable. And how long the colour markings last.
This unusual looking crescent mark is likely to be permanent. But some colour markings, like white spots on dolphins, change slowly over time.
Saw this dolphin with a really weird looking crescent mark, behind the blowhole! The second photo shows what that crescent mark normally looks like.
