Zygodactyl

-A Zygodactyl animal has two pairs of toes on each foot aligned opposite to each other, two toes on the front of the foot and two toes on the back.

Wow.  Isn't that just one of those awesomely specific words?  I'm thinking that if you have a reason to use this in conversation, you are absolutely required to, now that you know it.  Also, it's great fun to say.

(suggested by the love of my life, Ingrid)