hello all, this is my first post. love the site well i let my 20 chickens out of the pen yesterday evening about 2 hrs before dark like i always do. when i did my head count after dark i only had 18! now my barred rocks are like pets to me. once it got daylight 1 of them returned w/o the other...... any idea why they didnt return to the coop? should i be worried? walk through the woods looking for her? thank you in advance.