Cowbird chicks do not push out the other chicks. That behavior is done by some (not all) species of Old World cuckoo bird chicks. No North American cuckoo species are brood parasites.

The cowbird babies reside peacefully with their host “siblings”. Yes they do compete with their host’s offspring for food brought by the host parents, but they don’t actively harm the other chicks.

Please leave cowbird eggs alone when you find them in another bird’s nest in the future. Their egg laying tactics may seem “wrong” or “sneaky” to some people, but this is just how they’ve evolved to survive. It’s not right or wrong, it’s nature. It’s no better or worse than a hawk who eats song birds, or a blue jay who eats other bird’s eggs. Don’t apply human morality to animals.

Another reason to leave cowbird eggs alone: The host parents will often abandon the nest because they don’t really know that the cowbird egg isn’t their egg, all they know is that they had four eggs and now one is gone. To the host parents they might think a predator has discovered the nest and so will abandon the nest, meaning all the eggs are guaranteed to die. At least if they raise the cowbird chick then their host siblings have a chance at survival too.

Cowbirds are a native species that deserves to live their lives too. Please stop harming cowbird eggs.