We could also add ostriches, seals, and otters to the list.
Somewhat like the Irreducible Complexity argument, creationists will often argue "what good is half a wing", or other such nonsense. They claim that whale transitionals couldn't exist because what species could survive being partially adapted to the water and partially adapted to land?
A picture of an ostrich, seal, or mudskipper usually shuts that argument down very quickly. At the end of the day, evolution has a much better imagination than creationists do.