By weight, five of these 
equal one of these 
How do I know?
When five house sparrows perch on my squirrel proof bird feeder, the lid tips and the feeder closes. That’s exactly what happens when one common grackle lands there. Four house sparrows aren’t enough. It has to be five.
Does your feeder do weight conversions?
Post a comment and let me know.
(photos by Chuck Tague)
I have never looked at it that way. Interesting. I do know on my bird feeder the morning doves land and topple the whole feeder so the feed spills out, hence they eat.
I will have to keep my eye open to see if any other birds land there and topple it.
My squirrel proof feeder is not squirrel proof! The squirrels just sit on the roof and reach for the seed, not sitting on the perch at all. 🙁