There are over 70 free demos of indie games available on the Xbox store right now. Here's the full list.
In SkateBIRD, you play as a bird who skates.
Are you thinking about bird-based video games, for some reason? Here are some you may not have heard of. (And obviously the one you definitely have.)
If you like skateboard games, birds, and portmanteaus, then you'll want to keep an eye on Skatebird.