Find out information that is not commonly known about an animal. You can only show one image.
You can talk about their physical characteristics, about their unusual habits or behaviour, about their connection with humans, their evolution...
Some sources of information (there are many of them!)
Watch real people speaking very well
You should be able to speak for 5 minutes. You will probably find plenty ofvideo material on Youtube that can help you as well. Remember your goal is to make everybody undersand what you are talking about. That means, you will hve to rephrase and explain some comcepts.