Will they eat this weed?

[Dolivo]

The last three years my chickens have kept their yard completely weed free. This summer, they have let grass and weeds grow. One weed in particular, pictured below, is taking over the yard. They get 2-3 feet tall and the chickens aren't touching them. Is this a poisonous weed for chickens?
Thank you.

 

[crazy4ChickensNducks]

I’m not sure if it’s poisoness but some weeds are just to armored or tough for chooks to take down

 

[Dolivo]

I’m not sure if it’s poisoness but some weeds are just to armored or tough for chooks to take down

It's not a tough weed. It has no thorns or spikes.

 

[adickenscoop]

It is hard to tell from your photo. Why don't you take a look on PoultryDVM's toxic plant page? - http://www.chickendvm.com/toxic.php