What cow has the biggest horns?

It's hard to definitively say which cow breed has the biggest horns because:

* Horn size can vary within a breed: There's natural variation, just like with humans!

* Horns can be modified: Some breeds are naturally polled (hornless), and horns are often removed for safety.

However, some breeds are known for their impressive horns, and these often compete in "horn measuring" contests:

* Watusi: Known for their enormous, spiraled horns that can span up to 6 feet.

* Ankole-Watusi: Another African breed with large, curved horns.

* Texas Longhorn: Known for their long, sweeping horns that can span up to 7 feet.

Ultimately, the "biggest" horn size is a matter of perspective and specific measurements.