But zoo officials say the primates don't understand the idea of using weapons and were never in any real danger.
A keeper carried the paring knife into the enclosure to help prepare food for the gorillas, said Cathy Gaviller, the zoo's director of conservation, education and research.
He stuck the blade in his pocket, but it slid out unnoticed and was left behind.
Soon, a curious Barika stumbled across the shiny object and picked it up by the handle.
Calgary zoo says gorilla wasn't picking a fight by pointing knife at cage mate - Yahoo! Canada News (external - login to view)
For a minute I thought things were so bad in Calgary that the zoo animals were turning to crime?