First Contact
For millions of years, dragons were the only sentient species on the earth. I'm not saying that other species don't think, but there was nothing out there that had even approached our level of conscious thought, introspection and development - yep, we were millions of years ahead of everyone.
As we had seemingly forever, we watched and studied the world around us. We were in awe at the changes, the evolution we saw occurring.
Mammals became the dominant land animals. Among the mammals, there were a few archaic egg-layers like the ancestors of the platypus and echidna. There were larger numbers of pouched opossum-like mammals (marsupials). The few placental mammals that existed at that time mainly consisted of insectivore, ancestors of primates. Most of the mammal species were small, ranging from about the size of a mouse up to a medium size domesticated dog. The large grass-eating placental mammals, such as cattle and wildebeest, were absent as there were no vast grasslands. Rodents and seed-eating birds were also absent. The great proliferation of flowering plants had not taken place yet. However, forests of broad-leafed trees were developing over much of the earth.
Over several million years, global conditions continued to change. The tectonic plates continued to move - stretching areas (as an example, creating the Great Rift Valley system in Africa) and compressing in others (creating the Himalayas and Tibetan Plateau in Asia). The climate also changed, with drops in the sea level and the appearance of continental shelves which allowed for animal migration.
The most dramatic changes began to occur as large grasslands developed, followed by the emergence of grazing and browsing mammals with tough hoofs, grinding teeth, and digestive tracts specialized for the processing of grass, leaves, and other fibrous plant materials. The evolution of these herbivorous mammals provided the opportunity for the evolution of the carnivorous mammals specialized to eat them (lions and tigers and bears, oh my). And most of these animals were placental, rather than egg-layers or marsupials.
As mammals grew, expanded and evolved, dragons thrived. It was a paradise - plenty of food and basically no competition. We kept spreading out - across the landscape and through time. Our ability to access and manipulate the power of the ley lines kept growing (some large massive skills and some amazingly fine skills) - some of us wondered if there were even limits. We found that we used less and less technology, depending upon our physical and mental abilities to survive. (And we enjoyed being at the top of the food chain.)
One of the things many of us did was to continue to push our abilities to change our own bodies. There continued to be fanciful changes to our appearance such as brightly colored feathers or long dangly ganglia on our chins. We developed our abilities to heal ourselves - healing cuts or broken bones, pushing out poisons or biological parasites or viruses. And many of us were fascinated with mimicking the developing creatures around us - usually the predators (who wanted to be a deer or antelope?).