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A pair of animal behaviorists at the National University of Singapore, has found, via testing, that Oriental pied hornbills have object permanence levels comparable to apes.

United kingdomNational university of singaporeSingapore generalOulet ifansasti gettyElias garcia pelegrinRuitong yaoNational universityBreakthrough discoveryGetty imagesAnimal cognitionYellow billed hornbill faces local extinctionClimate changeOriental pied hornbillsLub of birdsObject permanence