Dr. Pol Vet Rescue is a beautifully presented puzzle game created by Neo Pangea for National Geographic. Created to tie in with the TV show The Incredible Dr. Pol, you have to diagnose and treat the ailing animals. You do this by collecting vitamins and greens, and in later levels by dropping the nasty parasites off the board.
Although it plays well on desktop it really comes into its own on mobile where the touch controls give it a much more fluid and effortless feel.