Quote:
Originally Posted by Happydaz
If it was a bird who killed the bluebird offspring it was probably a house sparrow. There are some ideas on discouraging them, such as cleaning out the birdhouse if they have built a nest after evicting the bluebirds and then move the nesting box to another location. Since these sparrows are not native birds they are not protected, bluebirds are protected. If you have a bird feeder nearby stop using it or relocate it farther away as seed feeders attract house sparrows. You can also purchase wider, slit opening bluebird houses that deter the sparrows who prefer a round hole. You may need a wire mesh guard over the wider opening as animals may have increased access to the babies. If no house sparrow builds a nest after this calamity maybe it was another creature. Usually a house sparrow throws out the bluebirds to build its own nest. Good luck! Keep trying.
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I see mocking birds fighting huge raven type birds and other birds all the time. I also saw the bluebird parents fighting them off once, I thought nothing of it at the time. I am usually not a birder and don't put seed out for them. They nested in a decorative raccoon on our light post. I knew it had a hole with a nesting area, but never thought a bird would choose it. Now that I have experienced this tragedy with these sweet songbirds who sang me beautiful songs, I have changed.