A weight sensitive feeder closes access to the seed openings when a certain 
amount of weight is on the perch. You can calibrate to exclude birds such as 
starlings, red-winged blackbirds, grackles, etc. 
I did see a few clever starlings who learned if they continued to flap their 
wings while only partially applying their weight to the perch, they could poke 
their beak into the much narrowed slot to get a seed. However, it required 
effort and energy. Not many persisted. I have my feeder set to support 
cardinals and smaller birds. 
Good luck!
Holly, Eaton Birding Society member

> On Apr 21, 2021, at 2:05 PM, Deb Grantham <d...@cornell.edu> wrote:
> Hi,
> A neighbor of mine is bothered that she gets a lot of grackles and starlings 
> at her feeders, and that they hog all the food she puts out. Any suggestions?
> Deb
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