Photographic reconstructions of the life activities of the animals, available in library books on dinosaurs. Good examples are in the two volume set by the Natural History Museum of Los Angeles County, 1987. For example, the reason that predatory sharks have such a shape is they must be streamlined to catch prey. Birds, in order to fly, must have lightweight but strong, long wing bones. For example, since teeth are used to grasp and cut food, the tooth's shape must be effective in catching and chewing the type of food that the animal eats.
Paleontologists determine the best model from the real world to use as an analogy for the body part.
For example, the best machine to cut wood is a saw. Therefore, you would expect the jaw of an animal that eats hard, woody plants to have a battery of teeth in it that could cut like a saw. Then demonstrate these four types of dinosaur feeding patterns by using the tooth models to grasp and process the imitation models of the appropriate food as a dinosaur would. For example, use the saw to cut up the small leafy branch, as an herbivore would have used its battery of teeth to cut up ancient uplands plants. Examples are listed below.