Yaarel
🇮🇱 🇺🇦 He-Mage
A bear with feathers and a beak?No, the point is, real world science does not work. There is absolutely no way you could create an owlbear using real world science. There is no way a dragon can fly and breathe fire using real world science. If you invent "alternative science" such as Biomancy, that's magic. You can try and dress it up using scientific-style language, but it's still magic.
That seems the easiest concept for science to achieve in reallife.
Dragon − a snake with with eagle claws and eagle wings, maybe with lionine head. Likewise relatively easy.
A large dragon that can fly, maybe the size of a quetzalcoatlus?
At a certain point, a dragon feature might require artificial technology integrating other materials. But this too is conceivable.