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Slinger, WI, USA


This is a Song Sparrow’s nest with a Brown-headed Cowbird’s egg, but what bird laid the bluish-white speckled one?

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Species: House Sparrow

Unknown Egg!! Maybe House Sparrow??

4 Song Sparrow eggs, one Cowbird egg,... and... ???

7 responses to “Unknown egg!! Maybe House Sparrow??”

  1. Owls3.0 says:

    The 4 to the right are Song Sparrow’s, the bottom left is a cowbird’s.

  2. Micah Grove says:

    Huh, okay, I had three Song Sparrow nests last year and all of them had 3 eggs that you called a “Cowbird egg”, then the other egg looked like the “Song Sparrow egg”. It could be a House Sparrow egg but it’s probably not cause they nest in cavity’s. Maybe House Finch.

  3. Owls3.0 says:

    But House Finches aren’t nest parasites, and these eggs have many more speckles than a House Finch’s.

  4. Owls3.0 says:

    I don’t know what to enter in Neswatch!

  5. Holly Faulkner, Project Assistant says:

    Hi all, These 5 all look like Song Sparrow eggs – there can be some variation in the speckling of their eggs – they are not always identically marked. The 6th egg does indeed look like a cowbird egg however, though a bit small.

  6. Texas Bird Family says:

    Cowbird eggs are white with brown speckles.

  7. Texas Bird Family says:

    All five are song sparrow eggs. Not cowbirds.

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