My dragon shifter character when a dragon is about around the same size of a T-rex. The body shape is very different though. I'm not good with measurements but the wings in proportion to his body would be just slightly bigger than how big a flying foxes wings are compared to their body. In my book dragonic animals have slow metabolisms similarly to how snakes do. My character can eat like a regular human and then that carries over so he's not hungry in dragon form. Like some whales in real life, dragons in my book have extremely long lifespans but also don't reproduce very regular. This slows down overpopulation but sadly mad many variants go extinct due to hunting.