static void AbstractDemo()
{
Trex trex = new Trex();
Triceratops triceratops = new Triceratops();
trex.EatFood();
trex.Move();
trex.Speed();
trex.Habitat();
triceratops.EatFood();
triceratops.Move();
triceratops.Speed();
triceratops.Habitat();
}