Actually yes I do know. I was hired by Apple 3 years ago as a "wildlife photographer" or as the position is better known, "Holy hell are you INSANE?" I trained for years as a photinja (a photographer/ninja) so I could manage to throw the snow onto the leopards back AND snap a perfect picture before being mauled. Quite the harrowing feat I assure you. 🙄
Ok seriously given that snow leopards are an endangered species my guess would be that Apple found the picture somewhere (under creative commons, or something else where they would not be sued for using it) and dropped it in. Either way I like it, its currently my desktop background 🙂