Discover and read the best of Twitter Threads about #hybirds
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What happens when species with similar phenotypes experience secondary contact? Introducing our @biorxivpreprint: Cryptic and extensive hybridization between ancient lineages of American crows. biorxiv.org/content/early/… 
Most species and most hybrid zones have historically been described based on phenotypes, but speciation and hybridization can also occur with negligible phenotypic differentiation. biorxiv.org/content/early/…
American and Northwestern crows are longstanding taxonomic species with a continuous distribution on the Pacific coast of North America. They lack reliable traditional characters for identification. biorxiv.org/content/early/…
