wow, that's an incredible photo.
When the largest one ( I'm guessing first hatched F1) was attacking the others BR was keeping a very close eye on them and started feeding the little ones. The largest one was very strong in comparison and could keep their head up and seemed way more developed than the other two.
All very interesting. I'm not so fond of feeding times as it's all a bit gross early in the morning
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but feeding time allows a lot of their inate behaviours to be seen.