Don't you realise the dinosaurs were going to evolve into dragons if it wasn't for the meteor.

The dinosaurs (what was left of them) evolved into birds. Birds don't breathe fire, but they have lasers. Listen, can't you hear the different types of lasers? https://www.youtube.com/watch?v=s9dbAfjlrks https://www.youtube.com/watch?v=lKzM-LhoxR8
And the lasers are powered by electricity, that's bugs https://www.youtube.com/watch?v=bcuKTheCcsE
The bugs are mobile, can move around, because electricity can move down wires. The bugs are powered by the plants, some eat the leaves, some eat the nectar. Some eat both in different stages of life. Plants are of course powered by the sun, it's a solar powered laser system.

Dragons can fly, so, maybe the birds are just a type of gimped dragon with figurative solar powered lasers instead of fire.