Mine not only recognize people but the jackets they wear also.
AND the sound of their voices. I wore my husbands work jacket outside because it was close to zero out and when I walked down their they all went crazy! Than I talked to them and they all came out from under the coop.
When it comes to voices, my brother in law come over to visit and he walked down with my dad to see the chickens. Not one of them come out from under the coop because they heard him talking (he's got a really loud voice) and they were scared of him.
As soon as he left they come running out.

When it comes to voices, my brother in law come over to visit and he walked down with my dad to see the chickens. Not one of them come out from under the coop because they heard him talking (he's got a really loud voice) and they were scared of him.
