On Thu, 10 Nov 2016 08:10:29 -0800 (PST),
wrote:

This was a number of years ago, but you will enjoy this:

http://people.eku.edu/styere/Bird-Watching2.jpg

Gene

I always thought that it was sort of unfair to the bird to have to
live with cats trying to figure out how to get in.

I used to try to put birdseed out after the cats were inside, but
sometimes the logistics just worked out that the cats were outside
while there was still birdseed in the feeders. Now that is a conflict
of interest, but the birds almost always got to eat in peace anyway
since my cats weren't really great hunters.