system
Given the following post, respond as if you're commenting on Reddit:
human
[Fantasy/General] How would magical creatures fare on earth?

Specifically, what would happen if, say, a dragon, chimera, gryphon, unicorn, basilisk, or hydra were put under real world physics? (other creatures would be appreciated, it's for a tabletop roleplay I'm doing that involves the removal of magic from these creature's existence. I know it would probably be horrible and disfiguring, but that's kind of what I'm going for here)

Edit: to clarify, this theoretical world would *have* magic, and these creatures would use them, but it would then be suddenly removed.
gpt
> Dragon

Flight and firebreathing actually work, if we assume that dragons have internal hydrogen sacs (or other exotic organs). As apex predators, dragons would also have enough mental complexity to be as smart as they are described in literature.

Megafauna and apex predators (c.f. mammoths) have not fared well alongside humans. Fortunately we have jet fighters and apache helicopters, which will do just fine against dragons if their scales are built from conventional materials. If dragons have magic and are highly intelligent, then we're screwed. If dragons are only highly intelligent, then after they see vehicle-mounted weapons they may decide to steer clear of humans, or arrange economically favorable partnerships (c.f. Naomi Novik).

> chimera

Multiple heads will only work if one head has control, which is fine. The rest of their abilities are normal. They'd probably crowd out existing apex predators on sheer agressiveness.

Humans don't have much trouble with lions because lions don't actively seek out and hunt humans. Chimera would fare similarly, although we'd probably go out of our way to drive them out.

> gryphon

They would have to be small for the flying to work, maybe the size of a bobcat. They'd fit in pretty well with existing avian apex predators, although the food requirements for their complex musculature would put them at high risk of injury from constant hunting. If they are intelligent, their food requirements will be ridiculously high, but they would have an advantage over avian predators and lions if they can effectively hunt using pack tactics.

> unicorn

Those are already in the fossil record. We also have lots of two-horned species that are about the same. Nothing implausible here.

Of course, their horns would be so coveted by human poachers that they would quickly be driven extinct. If we're lucky, some will survive in captivity. If they remain intelligent, they'll probably avoid humans at all costs.

> basilisk

It's just a komodo dragon. Why is this a question?

> hydra 

See above note on multiple heads. Its size is comparable to large dinosaurs, which wouldn't work in current Earth conditions because of the lower oxygen content of the atmosphere. It would have to live in the water and stay sedentary. It could hunt like an aligator, which would make it scarily effective even if it couldn't swim well.