
but I think their body clocks are off as I have been seeing them every year for about the past 6
( ,
Wed 16 Sep 2009, 2:27,
archived)

Also some will skip a year or pop out a year early.
I think the ground temperatures give them a clue
as to if there will be enough time before frost.
( ,
Wed 16 Sep 2009, 2:31,
archived)
I think the ground temperatures give them a clue
as to if there will be enough time before frost.