Is there a list of the various birds that may be seen and what time of year they have been spotted?

No

I do not believe that they have this posted. However this is not a bird sanctuary so you will probably see a good mix of the local species.

I didn't see one posted, however I didn't make it inside the visitor center either. But there was staff around, maybe they could help.

I have not seen seasonal birds. but the birds I have seen are local and they are somewhat tame allowing you to get a easy photograph of them.

Not sure, sorry.

I did not take note of that while I was there.