Cowbirds, nature's ultimate parasite
The white speckled eggs belong to a brown-headed cowbird which is parasitizing a chipping sparrow's nest. The blue egg belongs to the sparrow. Both birds are native species to Montana. (Montana Fish, Wildlife & Parks photo)
In the birding world, it’s commonly known as parasitizing.
Merriam-Webster defines it: ‘to infest or live on or with as a parasite...
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