A few weeks ago we noticed that one of our nests had a robin coming in and out, a couple of days ago, the nest was on the floor and sadly it is very clear that a newly hatched bird has been killed as it is visible inside the nest, I can see its legs basically. I am so upset about this and can't understand how it happened as the nest has been there years with no issue and now it has finally got a visitor I am so sad to have found it on the floor. Should I remove the dead baby bird? I am unsure if there are more in the nest but have been watching it having placed it back and put some chicken wire over it and the robin seems to have abandoned it. Thank you for your help on this. Very sad to have discovered this and just don't know what to do.