How do chickens tell the time?

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Ruwan Rodrigo

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How do chickens tell the time?
« on: 01/08/2008 12:19:07 »
Ruwan Rodrigo asked the Naked Scientists:

My family used to raise chickens, in a small farm in Sri Lanka. We used to let them run free during the day and would close them up in a coop at night. On Fridays, we used to close them up a few hours before the sun went down. After many months, we noticed that all the chickens on Fridays would already be in their coop 2 hours before the sun went down, waiting for us to lock them up.

How did the chickens know how to keep track of time? It was quite amusing; I could never figure it out
What do you think?

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Offline opus

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How do chickens tell the time?
« Reply #1 on: 01/08/2008 13:18:42 »
They use an egg-timer of course!