Jennifer Atkins says:

here are about 5,000 named mammals in the world, and I’m going to draw them all! I draw one a day, with marker and colored pencil, and I take requests. On December 22, I’m going to have an event called 24 Mammals in 24 Hours. Anyone who donates $25 or more to Defenders of Wildlife through my site will get to request a mammal, see a drawing of it on December 22, and then receive the original art in the mail.