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#6 - willysbilly (01/09/2013) [-]
Birds heading south for the winter isn't an example of timekeeping? Several animals keep track of the seasons and bust their asses rushing to do something in time, i.e. bears, squirrels and other hibernating mammals that work hard to stuff themselves before the cold. Just because they don't have physical clocks doesn't mean they aren't governed by time constraints.
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