@aazad It's possible to search at Google Scholar for Corvidae and related. That will get you research papers. I'll admit I'm mainly a photographer and watcher of ravens. Most of what I've read was decades ago.
@Eka_FOOF_A Thank you, my go-to is usually repositories of journal articles but there are quite a bit and it's inefficient to trawl when other people have done the work by way of landmark studies in the niche so asking around is more efficient.