What do gray dolphins eat?

No they cannot be black and white unless someone painted them.

Another answer

Killer whales (Orcas) are black and white, and they are the largest species of the dolphin family.

Another Answer.

Its the Commerson's dolphin(cephalorhynchus commersonii),Hourglass dolphin(lagenorhynchus cruciger) and of course the epaulard#.

#Epaulard is orca in french.