Animal

Even though I just upgraded to Snow Leopard, I see that Apple is now out with OS Lion. I think all that's left for future choices are OS Ocelot and OS Cheeteh, neither of which sound appealing; OS Cheetah for obvious reasons and OS Ocelot because it sounds like "OS cost-a-lot" if you say it quickly.
It's good to know however that long after all the big cats have become extinct in the wild, they'll continue to live on in the MacIntosh Menagerie.

song: Animal • artist: Def Leppard