Black, with white stripes - or white, with black stripes?

It was previously believed that zebras were white animals with black stripes, since some zebras have white underbellies. Embryological evidence, however, shows that the animal's background color is dark and the white stripes and bellies are additions.

Photo closeup of a Grevy's Zebra at the Frankfurt zoo by Fredrik Von Erichsen//Getty Images, via The Big Picture (from a nice set of 57 animal photos).