Beefalo

A cattle breed with a share of American bison ancestry, defined by the American Beefalo Association as at least five-eighths cattle and at most three-eighths bison. Cattle and bison were first deliberately crossed in the mid-19th century, and Bud Basolo developed the modern breed in the 1970s. Early crosses gave fertile females but rarely fertile males. Two twists make it worth knowing. A 2024 genomic study found most sampled beefalo had no detectable bison ancestry at all, while the genes flowed the other way too: many of today's bison herds carry some cattle DNA.