My sister finally had a bluebird nest in her box, had wee tiny babies, she saw a Tx mockingbird fly out and went to check this past Feb end. It had literally torn them apart, shredded pieces of baby bird left. Broke her heart, but Tx mockingbirds are fierce (even if it didn't actually eat them? I wasn't there to verify) She is in Clarksville, Tx and does have the bluebirds, phoebe, scissortails, mockingbirds, wrens...