21. Average Sizes
Although most of the fossils found by paleontologists are massive, the majority of dinosaur species were about the size of humans or smaller. It’s believed that the larger bones held up better during the process of fossilization, which is why they are more prevalent today. Their bodies might have been small on the dino scale, but most of them actually had tales that were 45 feet or longer. The longer the tail, the better the balance while running and hunting.