There have been many informative responses, like this one, to my musings
about the roadside raptors. It seems the roads not only pose a kind of
barricade that corrals the rodents, but also an excellent food source for
rodents, due to the mowing and extra rain run-off that allows favored
seed-bearing plant life to proliferate, while offering the prey little
place to hide. Additionally, it was mentioned that such rodent high-traffic
areas are likely to have rodent "latrines", where the urine trails would
attract notice from a raptor's extended ultra-violet detection abilities.
Now I understand why so many of the nests I've noticed along highways have
turned out to be raptor nests.
Thanks for all the replies.
Linda Whyte

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