Adria wrote: ↑23 Jul 2022, 19:0219.46 - K1 and K2 : battle of beaks ...
bill fencing is very essential in their life
prof. PZ says: "bill fencing is evidently training in the precise use of the bill"
(viewtopic.php?p=6796#p6796) and " they train in this way to use the bill as a weapon and a tool for catching fish; so training for future uses"
(viewtopic.php?p=6525#p6525)
edit:
years ago one zoologist/ethologist answered to me, that it is also a way for them to exchange saliva in order to identify themselves as relatives in the future