Traditionally the wings of fantasy animals have been far too small for their weight, or, perhaps, it might be more appropriate to say that people have not considered incorporating the weight-saving features used by birds and bats.
Edited to add, the article on their web site explicitly says that they chose to use pterosaur wing features because they have wing muscles on both chest and back, while birds have all of them on the chest.
See https://www.scientificamerican.com/artic...-of-fancy/
Edited to add, the article on their web site explicitly says that they chose to use pterosaur wing features because they have wing muscles on both chest and back, while birds have all of them on the chest.
See https://www.scientificamerican.com/artic...-of-fancy/
Selden