Dragons

You overhear a man in an oddly tailored suit at the bar exclaiming quite loudly "Weeeeell dragons on this planet are a bit weird now, aren't they."
"I mean first off, you got the eggs, right. Now a right proper dragon egg anywhere else in the multi-verse is gonna be at least the size of a watermelon, and here you lot are, biggest one ever recorded on the whole planet was the size of a turkey egg. I mean honestly. You could at least have eggs the size of and emu or maybe an emperor penguin, but noooo.... course I dont suppose you lot have any idea what those even are... right... dragons...
"Then of course you have how they grow. Other dragons in other places grow normaly, well... normally for dragons anyway. Hatch, hunt, eat, grow, hunt bigger things, eat more, grow more, eventually they are bigger than a house. But not here, noooooo. (Don't get me wrong, your dragons do eat, I'm not saying they dont). Here though, here they start out small. Barely big enough to hold a coin. Because here that is how they grow. Bigger the horde, bigger the dragon... well, at least until some adventurer or a meaner dragon comes along and steals some without killing them (dont give me that look, it happens... occasionally). Not that they get smaller when it happens, most living things dont un-grow, I mean that would be like de-aging and that takes powerful magic... even more powerful if you dont want to un-learn while you do it.
"Anyway, dragons, yes. So they dont really die of old age either. Keep em fed and they live practically forever. Learning the whole time. Young dragons are dumb, old dragons are very, very, very smart.
"And the colors, you lot got that all SORTS of wrong. I mean your dragons are different colors. But have you ever wondered why you dont have a white dragon ever in a desert, or a red dragon in a swamp. No, because that wouldnt make sense. Just like metallic dragons living not near population centers would be weird, because dragons are so tied to the magic of their environment that if you were to move one to a new habitat it would change and adapt because what they really feed on, if you can even call it that, is the ambient magic in an area. Absorbed through their treasure horde because metals and gems and things can store and conduct magical energy which some of you already know because HE'S A WIZARD!... joking, sort of, but not really
"And THAT is why your entire classification system is wrong. You sort them first by color because they look different, and they breathe different things so they must BE different, when in reality they are no different than a labradoodle and a dogue de bordeaux (and you have no idea what those are). Same species different habitat, different adaptations because MAGIC! (And evolution... sort of) "Then it's by age but its not really by age is it? It's by size. You say ancient but you mean huge, because the most ancient dragons on the planet are smarter than that. Big tempting horde for people and things and other dragons to try and come steal. That's like as not to get you killed if you're a dragon. Oldest dragons in the whole wide world are hidden in plain sight, but the lot of you leave them alone. Which is mostly what they want... mostly what most things want really. The things they could teach you though...
"And thats all the biology lesson I have time for here I suppose. I bid you all good night as I have places and whens to be and go in the morning," the stranger says, sliding a coin to Edd and heading up stairs, even though its just now lunchtime. As you finish your meal a strange, pulsing creaky-groan can be heard from upstairs before fading to silence.
"You really ought not to keep renting out rooms to crazy magic types Edd, at least we didn't have to rebuild the tavern this time, dont right know what comes after Thrice-built but it probably doesnt have as nice a ring to it"

Additional Information

Domestication

Older dragons, both large and small, have been known to take pity on and domesticate both individual humanoids and larger populations of the same.

Average Intelligence

Due to either a genetic fluke in their evolution, or their intrinsic magic, dragons have nearly photographic memories. As such, the older or more traveled a dragon is, the more intelligent it gets.

Lifespan

300-500 years due to "adventurer related mortality"