Simon Roper | Crows and Corvids in Early Medieval England @simonroper9218 | Uploaded April 2023 | Updated October 2024, 20 hours ago.
A lot of the bird calls were found on xeno-canto: xeno-canto.org

The Cornell Lab also has a useful website where I found the raven sounds: allaboutbirds.org/news

MER Lacey's thesis can be found here: discovery.ucl.ac.uk/id/eprint/1431318

And Ramirez's is here, although I'm not sure whether it needs an institution login: ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432238


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