Now when I'm doing educational/display/entertainment talks here's basically what I do...
*Introduce the animal by name
*Have them guess what it is
*Tell them what it is (if they are right, if they arent correct them)
*Ask if they think it is full grown or not
*Ask where they think he comes from, environment and location
*What he might eat
*Cover things like lifespan, husbandry, captive requirements, safety when handling them, give reasons for everything
*Go into status in the wild and some of its habits in the wild and how it varies from that in captivity
Main parts are just to keep the audience involved and not just you talking to them, have them ask questions at the end and always elaborate and go into detail about all points that you can. Express the amount of responsibility these animals are, just so nobody decides it would be a great idea to go out and get one as a "pet". Hope this helped a little
Good luck with your presentation