I once watched a crow fly to a robin’s nest 3 times and each time flew away with a hatchling....
We had pigeons nesting on our balcony; they were very tame. When the babies hatched, they let us come out and look at them and take pictures.
One day, one baby was gone. A few days later, we found the other baby headless in a pool of blood. We’re up so high, we knew it was crows; we figured something scared the crow away before he’d done more than take the head.