That's very surprising to see, birds will toss out anything wrong with a bird in the nest, like a runty hatchling or anything wrong that even we humans don't notice. My mother used to breed parrots and had a pair of cockatiels that abandoned their eggs. We got a pair of lovebirds to hatch the eggs but as soon as the eggs would hatch the lovebirds knew it wasn't one of theirs and killed the baby right away. 2 out of the 3 eggs got killed after hatching but we paid close attention to when the 3rd one was ready to hatch and took it away from the lovebirds as soon as it was far enough out of the egg to be considered hatched. My mother hand fed that little baby from day one, he was so tiny, we named him Shadow. That's pretty much what he was, my shadow, he followed me everywhere and sang to my toes. Oops, going a little off topic thinking about Shadow lol. So what I'm getting at is in my experience birds are very fussy about what they hatch and keep so it's a surprise to see something like an eagle take a hawk as it's own.
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