Dolphins - 4 stamps unmounted, Togo

You will receive four adorable stamps from Togo on the subject of "Wildlife in West Africa". They have a face value of 750 F. each and show different whales in the sea.
Dolphins are not created equal. There are a total of 36 species of dolphins, e.g. "Flipper" (actually "bottlenose dolphin"). Some have the word "whale" in their name, which is quite confusing - the orca whale, for example, is also a dolphin.