Who said it was theory?? :-)
Just watch birds gathering worms to feed the young in the spring. They
gather a beak full, fly to the gutter/housetop/tree before flying to
the nest. Some of the worms wiggle free on the way. Had one drop on my
bald head once. :-(
Perhaps the birds are using your rain gutters to raise their own worms. Just
However, I have found snake skins in my rain gutters. I assume they get
there by crawling up the trees. From the gutters it is possible to enter the
attic through air vents which explains the 3 foot long snake skin found in
the attic during some heating system work last month.
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