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I'm pretty sure that in "A Year In The Maine Woods" Bernd Heinrich says that trees which produce seeds will all all do so on the same year, and only about every five years. I guess that when they produce a lot of seeds there is a bump in rodent population because of the food supply being so excellent, so the next few years those trees won't produce as many seeds because if they did there'd be no point, the rodents would eat them all. They have to wait a few years for the rodents to die off a bit. This seems to be the pattern this year, because we had little trees popping up all over the place this spring. My neighbor even had some in her dog run. And this year there's so many squirrels being hit on the road that it's almost causing a road hazard.
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