<p> Video of an elephant knocking down and injuring his trainer at a zoo in Ohio in the US has been released. </p><p> It shows the animal pinning the keeper in a corner after being startled by his arrival in his enclosure. </p><p> The elephant then backs away before charging at the keeper, who has been in hospital since the attack three weeks ago. </p><p> The video was released by the Toledo Zoo and shows the keeper stumbling out of the enclosure while the elephant stands back. </p><p> The zoo's director says she iss not sure why the elephant turned on the keeper, whom the elephant had known since birth. </p><p> She says it looks as if he was startled and started play-fighting like elephants do in the wild. </p><p> The injured man and his family initially fought the video's release but changed their minds to show that the animal was not mistreated. </p>
