This was such a fun and simple project that I can't wait to make for my own nursery! (I made it for a friends baby shower).
First cut out a silhouette of a bird you like and trace it on card stock.
Cut out all your birdies.
Punch holes in the top and bottom of cut out (I found this 1/4 whole punch at Michael's).
Use beading thread (or fishing line) to thread together however many rows you'd like. I then found a branch in my back yard and tied them in 4 rows, but you can use anything! So simple and so cute!