Thanks Shoe, that's really helpful.
I'm currently growing squash along with cowpeas and corn in about 2/5 of an acre. It's a pretty good size and definitely too much to cover.
Moreover, covering the pumpkins -and- the corn just isn't really a solution for me.
What you said about birds is really encouraging to me. We have a lot of birds around here, especially bluebirds, but not so much in the area of the garden. I should make some structures for the birds to perch.
Thanks again - you've encouraged me.