In making these little cuties, I've come up with a quick add-on tail for them. You can easily use different colors and skip the comb at the top of their head to have the look of many other birds. Below is my version of a pigeon, made using this very pattern.
The add-on tail is very simple:
Flip the chicken upside-down and with color 1, pick up and knit 3 stitches on the bottom center of the body, just where a tail would be.
Row 1: Purl
Row 2: KFB, K1, KFB
Row 3: Bind off
Break yarn and weave in ends.
When you're finished, it should look something like this. Happy knitting!