Appendix. Colophon

The animal on the cover of PayPal APIs: Up and Running is an African wildcat (Felis silvestris cafra), also known as a desert cat or African caffre. Studies suggest that the common domesticated cat is yet another subspecies of Felis silvestris and that the cats domesticated themselves around 10,000 years ago in the Middle East. As agriculture developed in ancient civilizations, humans began to store large amounts of grain. These granaries attracted rodents, and in turn, wildcats.

Thus, the African wildcat bears a resemblance to domesticated cats, though it is roughly 1.5 times larger at 18‒30 inches long and 7‒14 pounds. Among their population, these animals are also much more similar in appearance to each other than house cats. Their coats range from sandy brown to gray, with a white belly and black stripes on the legs and tail. They have shorter fur and are smaller than the main wildcat species of Europe.