Re: [Maine-birds] 2 questions

Here's a helpful reference to the distance question:

https://sora.unm.edu/sites/default/files/journals/auk/v054n01/p0096-p0097.pdf

Bill Hancock

On Mar 28, 2021, at 9:43 AM, Dave Tucker <dhtucker@comcast.net> wrote:



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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