I once saw an Asian elephant in Thailand who had been trained to do a trick. All the schoolchildren brought to meet him at the reserve where he was kept in captivity were told to sit in a line. Then they were asked to take off their shoes, and these shoes were jumbled into a pile. The mahout who worked with the elephant then instructed her to give the shoes back to the children. The elephant did, carefully weeding through the pile with her trunk and dropping the shoes that belonged to each child in his or her lap.
Humans probably couldn’t do this.
