They read the back of the book:
"Thousands of years after the pantalan dragons escaped to pyhrria, the continent has grown bigger, thanks to the leafwings. Eventually the island had enough room that the pantalans didnt have to take refuge in the rainforest. For a while the tribes were peaceful.
But another group of dragons, the "Evils," have risen up, with plans to take over the world, and destroy anything that stands in their path."