Let's see, I'd like to ask why you want this information, how many chickens you want to track, and other broad aspects.
They are important for the design. Or is this just an excuse to play with arduino? smiley If not, we don't want to "lay an egg" here!
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Say, after posting this, I haven't heard a peep out of you 
What exactly are you trying to track? Number of birds, etc.