Platypuses or platypi?

So, I list 'the duck-billed platypus' for any profile that asks me about my interests. MySpace happens to gear its ads toward what you list under their profile categories. Here's the latest ad directed toward my interests:

http://www.platypusco.com/

The Platypus is "a flossing device for individuals with braces; simply the easiest way to floss with braces. The Platypus Ortho Flosser is an amazing revolution in orthodontic hygiene."

I'm not sure why this is funny, but it is.

Also, I like that the girl on the main page is wearing a cowgirl hat
.

Long live the noble platypi.