We have been observing blackbirds nesting in one of the bushes in our garden, it has been lovely watching the parents go back and forth with food for their brood. We’d heard chirping coming from the bush so guessed they would be fledging soon. We were extremely sad to find three dead babies on the ground near the bush this morning. A cat was on our fence nearby, but we don’t know how it could have got to the nest to get them, as it’s dense and prickly. It looks like the babies have been attacked, would a squirrel have done this (the bush is near a large oak tree where they live)? We even wondered if another bird or even the parents could have done it?