I was unfamiliar with this site and have spent well over the last hour reading over it.
The "sightings" are hit and miss.
I read several stories that I have no doubts of.
Others too far off. I say something "mis-identified" or perhaps an "illusion"

As far as the "scientific" info on his site...
I say is also hit and miss. Too many references to the gorilla.
The "Watcher" is different and more "clanish".
And they do have a "regular" resting place although I think theyare somewhat migratory.
My Opinion.