"Cougars", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
If you're lying in bed tonight and you see yellow eyes glinting in your window, are you being stalked by a puma, a mountain lion, a panther, a catamount, or a cougar? Trick question--in North America, they're all names for the same species, Puma concolor! Isn't learning fun? Anyway, sleep tight!