I had to google a picture of chickweed to see what it was....yes, we have it and yes, my chickens like to eat it.
We also have some other type of weed they LOVE even more. It's sort of a vine but doesn't have tendrils. It has leaves that are about 1/2 " x 1/4". It has a scratchy almost Velcro feel to it and develops tiny white flowers. I'll have to take a picture to see if anyone can identify it. So far, it's my girls favorite.
That looks like what we call Sticky weed
