Calling all chicken breed experts! I have a chicken that's about 3 months old now with no tail, and greenish legs. It's a bit smaller then the rest and looks completely different. Any ideas on what it may be? Thanks!
It's too hard to say for certain without better photos.
Araucana is probably the most common rumpless bird in America, and they are breeder quality, but should have yellow legs, and can be ear tufted or not. EE mix from that would not generally create willow (green legs). More commonly green legs is the result of an Ameraucana created EE trait.
There is the Manx Rumpless, essentially the OEGB without a tail, and the Persian Rumpless.
However, all of those breeds would be a rare find at a feed store or auction. Where did you get your birds?
One last thought, ANY breed can produce a rumpless bird due to genetic defect or faults in incubation. (That is considered "accidental" or "genetic mutation" rumplessness.)
The rumpless breeds have been selected for rumpless genetics (that are actually dominant vs. genes producing a tail).
But all told, we need better photos and info on where you got them to best guess what it may be.