In order to prevent sika deers from attacking each other, southwest China's Chongqing Zoo cut their antlers, according to a report on Chongqing Economic Times.

Some visitors found that all antlers of sika deers in the zoo had been cut which triggered speculation that the zoo had sold them or extracted them as tonic.

A staff member told Chongqing Economic Times that there are over 20 sika deers in the zoo. The zoo does not have large enough space for sika deers to run as they do in the wild. The sika deers might hurt others when they are in a relative small space. In order to avoid conflicts between them, the zoo cuts their antlers every year and the cut antlers are stored in a storeroom.