Humor me for a minute here...
When I was in grammer school, I had an idea about dinosaurs. We were learning about the relationship between plants and animals. Animals breath oxygen, plants breath carbon dioxide. Each one released exactly what the other needed. I thought it would take a lot of animals to keep up with all the plants on earth when first created. But maybe God created giant dinosaurs to establish a balance in the atmosphere. The balance was established, then they died (Never really thought about how... I remember a mag or brochure saying they may have died in the flood, I think). Of course at that time I already had many JW doctrines running through my head, and I was only about 10 years old. Hadn't given it much thought since, but wanted to share my thoughts.