Writing in the Biological Journal of the Linnean Society, she reported that, once their quota of seven fish was filled, the birds "stubbornly refuse to move again until their neck ring is loosened.
Ia melaporkan dalam tulisannya pada Biological Journal of the Linnean Society, bahwa setelah kuota tujuh ekor ikan terpenuhi, burung-burung tersebut "berkeras tidak mau bergerak lagi sampai cincin di leher mereka di kendurkan.