...just using them as test subjects to learn more about the mechanism of their detecting abilities, and not planning to move them around much. It's too bad that they aren't more 'portable,' since they are so good at it!

I saw some being tested for long-term memory.

They took guests to a reserve, I think it was, and introduced the elephant to the people.

Later, they brought the visitors back, and had them stand in a different order then they had been originally.

The caretaker of the elephants would throw his hat, and ask the elephant to give the hat to, say, Jason. And, he did, handing it to Jason. He didn't make any mistakes when asked to give it to a person, even though he'd only heard the person's name once.