{"fact":"Despite their near-identical looks, American and Northwestern crows are divided into two distinct genetic lineages, which remained hidden due to the lack of noticeable physical differences.","context":"Genomic SNPs and mtDNA sequences both revealed distinct evolutionary histories for Northwestern and American crows, supporting two different clustering approaches.","source":"David L. Slager; Kevin L. Epperly; Renee R. Ha; Sievert Rohwer; Chris Wood; Caroline Van Hemert; John Klicka, Cryptic and extensive hybridization between ancient lineages of American crows, 10.1111/mec.15377","index":661}