I've made this tiny bird on a weekend during my summer hollidays in south of France, when the sun was way too hot for me! It took me about 2 days to finish it. It's simple assembly, no glue is requiered, just toothpicks and that will do the trick.
The only tools you need are a sharp knife and toothpicks, a needle or something to drill holes for them.
Step 1: The Head
I started by the head, from a curved branch, to have a natural neck. Cut the beack as long as you want, shape the head and the neck. You can drill 2 tiny holes for the eyes, then use a really tiny branch, force it in the hole and cut it, you will have the center white, and around will be brown. I added a "feather" on the top of the head. There was an old branche hole so i used it to fix the feather. Most of the time with weeping willows, you will find the exact same hole in the curve of a branch, take a look ;)
Once your head is done, you can use your knife to cut the wood slightly, to make somekind of feathering.
Then come the body.