It can be extremely difficult to film certain animals in the wild and when/if you do find them filming them can be very tricky or even dangerous. Filming animals makes them accustomed to human presence thus they stop being afraid of humans which can end badly for both human and animal.

John Downer decided to eliminate the human presence from filming. He put cameras in logs and he fixed some on elephants. He fixed one camera in the form of a tree trunk on an elephant's tusk and one on another elephant's trunk.

Downer came up with this idea while filming tigers. He said "Elephants do not see tigers as a threat, and tigers are comfortable with elephants. So we had the perfect team"

Here are the results of his hidden camera experiment. These were most probably taken by the log camera. And although the cameras were hidden I'm sure the animals knew that there was something wrong about those logs.

via Dailymail.co.uk