static void AbstractDemo()
{
TRex trex = new TRex();
Triceratops triceratops = new Triceratops();
trex.EatFood();
trex.Move();
triceratops.EatFood();
triceratops.Move();
trex.Fly();
trex.Fight();
triceratops.Fight();
triceratops.Fly();
trex.Teeth();
trex.SkinType();
triceratops.Teeth();
triceratops.SkinType();
}