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  1. Maroon Jay

    Dead house wren nestlings

    Yes, Wrens do that also, but they are native birds. House Sparrows are an introduced invasive species. And there are a lot more of them than Wrens.
  2. Maroon Jay

    Dead house wren nestlings

    House Sparrow will enter a nest box and kill entire families of Tree Swallows, Bluebirds, and Wrens. I have even seen them attacking Purple Martins. They will even use the bodies of their victims for nesting material. I have Wrens nesting in my yard. I made the hole 1 and 1/8". Too small...
  3. Maroon Jay

    Dead house wren nestlings

    How big is the opening in the nest box? It is possible they were killed by House Sparrows.