A recent study tried to establish whether bird feeding assisted nesting
in bluebirds and chickadees. Bluebirds were provided mealworms and
chickadees a variety of foods. Results indicate that bluebirds nested
earlier but no increase in clutch size was evident in either. Bluebird
chicks were heavier but chickadees remained about the same.
Here is the Cornell write-up
https://nestwatch.org/connect/blog/does-supplemental-feeding-help-nesting-b…
Don
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Don MacNeill donmacneill(a)bellaliant.net