Long-finned Pilot Whale Globicephala melas 

As their name suggests, they have two very long flippers; they are crescent-shaped and have pointy tips. Adult pilot whales are black or dark grey and have a lighter grey saddle patch on the back behind the dorsal fin and an anchor-shaped patch on the underside. Image: John Bray (iNaturalist).

Find out more: Whale and Dolphin Conservation, The Mammal Society, iNaturalist