As I watched this chipping sparrow nest I noticed that one mouth was quite a bite bigger than the others. As it grew. It was just as I thought. A brown headed cowbird had laid one of her eggs in this nest. Mom & dad chipping sparrow were feeding like crazy to feed this baby along with 3 of their own. This is common practice with cowbirds. Who are twice the size of a chipping sparrow. I have seen song sparrows struggle to feed these gentle giant babies before. And like a true mom. They give it there all.
As you can see below this little or not so little nestling barely fits in the nest. Good news is though. They all fledged successfully.
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