We don't have Jays around here but I understand they are rather aggressive. Our House Sparrows are bad enough here!
Old pictures of House Sparrows gorging on our seeds & they chased off all other birds!
2011
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Some small House Finches that managed to get some seed but we never see Finches anymore since Sparrows invaded!
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When we fed the birds it was the Mourning Doves that cause all the drama - they look so sweet and gentle, and their soft coo-ing so lovely.
But whoa Nelly they were mean and aggressive!