[va-bird] Cowbird egg?

Va Birders,
Today I checked one my bluebird boxes and found a nest of Tree Swallows. In
the nest were 4 creamy white Tree Swallow eggs and one larger green egg. It
looks like a cowbird egg, but is not speckled at all. Does anyone know if
cowbird eggs sometimes don't have specks?

Roger Mayhorn
Grundy, VA

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