Comment by zahlman
https://en.wikipedia.org/wiki/Veronika_(cow) might be a better Wikipedia link.
Honestly I would have expected a pig or horse to be discovered to use tools, rather than a cow. Cattle are generally... not thought of as particularly intelligent.
Well, most cattle aren't given much to stimulate them, and they're bred for meat production and complacency. People aren't exactly looking to make the life of cattle fun or enjoyable.