Birders, Have often wondered whilst watching hawks on Mt Agamenticus, how far away is that Kestrel that is at the limit of my 8 power binoculars. Is it a mile, a half mile? A goldfinch disappears a few hundred yards away. An eagle, clearly, can be seen much farther away. So is there a formula or a quotient or one of those math things that can give one an inkling into the distance at which an object of x size eludes viewing?
Secondly, yesterday on Mt. A I watched a “kettle” of gulls roiling over the forest. They weren’t over water, and they didn’t rise very high at all. But the kettle did sort of wander back and forth over a limited area, and they did so for a couple of hours. I’m interested to know if anyone else has seen this kind of behavior?
Thanks, Dave
Kittery Point
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