Darren Naish may be a respected paleozoologist (a type of paleontologist), but he is not known in the cryptozoology community as a cryptozoologist, for he is just not a crytozoologist. He has, however, written a long page criticizing the concept of modern living pterosaurs. Here is a summary of one response to a criticism in a comment on that page:
Indeed we have many birdwatchers in the United States; I presume South Carolina is no exception. Watching birds is a popular hobby, but what is entailed? Well . . . watching birds and reporting those birds. So what does that tell us about a potential sighting of a giant Rhamphorhynchoid pterosaur? Well . . . nothing.
What would I do, if I were a birdwatcher who saw a giant long-tailed pterosaur? I would certainly not bother trying to look up “pterodactyl” on my report form. But what would a typical birdwatcher do? Cameron seems to have missed something important here, for birdwatchers, every one of them, are quite human. Think about it. Who wants to be called “crazy?”
All species of pterosaur need not be extinct simply because no birdwatchers have successfully publicized their observations of giant living pterosaurs. That is the essence, perhaps, of this web page supporting live-pterodactyl research.