Ok so I know these birds are not prehistoric, they're very much in the here and now (or the there and then when these photos were shot), but I am sure you will agree they do have a prehistoric look.
These are California Brown Pelicans which as their name suggests live in and around California. These were spotted flying and fishing in Monterey bay and Santa Cruz.
They are known for catching fish by plunge diving, unlike other species of Pelican, and I enjoyed watching them diving headfirst into the water and coming up with fish. It was very difficult to predict where or when they would dive because they gave no clear indication of when they were going to do it. I managed to ge5t a few shots of the water splashing as they hit the water but none at the critical moment when their beak touched the surface.
I had seen White Pelicans up in Thunder Bay, Ontario one time, swimming along in a flotilla, which was quite impressive but I think watching these in California was quite something.
Both the white and brown variants have suffered somewhat in the past and the white pelican is considered a "threatened species" in Ontario. A major threat in the past was the use of the pesticide DDT that through run off into lakes and rivers entered the food chain. It caused the birds eggs to be very thing and fragile so Pelicans like many other species that fed on fish were badly affected. Happily since the ban on the use of DDT many bird species populations have increased and since 2009 the California Brown Pelican was removed from the federal endangered species list.