The clever behavior of some animal

Animals sometimes display very clever behavior. An example of this clever behavior is not only how a killer whale can identify who is its trainer and who ever try to harm it's whale family but also can comprehend the different kinds of whistle mean. In the movie "Free Willy" you can see the main character, the killer whale Willy, whom can interact with the chief actor Jesse. He can use the different whistle commanding the killer whale to jump over the water tank to touch the balls which are hang on the roof and to do some funny movements to entertain the audiences. But the most clever behavior you can see in this movie is that the killer whale can identify who ever try to capture itself and it's family and fight back when the bad guys fall into the water from the fishing boat. Just like human beings, when they face the dangerous situation the killer whale will do something try to protect it's young sister and young brother. Therefore, I think the killer whale is one kind of the clever animals.