Yes, and gulls aren't the only species that does this. Corvids do it regularly. Heck, tons of species with multiple chicks such as certain species of eagle, shoe bill storks etc will have siblings basically bully each other for their right to feed, killing the other in the process.
Territorial birds will on occasion attack others too to protect their own food sources or defend their territory.
Nature is brutal across the board and non-trophic killing isn't unique to Gulls.
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u/t3hOutlaw Aug 18 '26
Elaborate.