Well, this was an interesting and rather lengthy fight between the two babies. And yes, the babies actually get into fights in the nest. Twice now, I've seen on the video two actual knock-outs in which the baby was hit so hard by his sibling, that he fell over knocked out cold and lifeless in the nest. With this particular fight, there were no knock-outs - just a lot of head butting and "beaking" going back and forth between the two babies. And what does Mom do during these fights? She just sits and watches. I've not seen her intervene not one time.