A cow with an ornamental cow-bell.
This photo was taken on March 7, 2003 at the Salon de l'agriculture (Agriculture Expo) in Paris, France. The animals presented tend to be exceptional specimens, and are groomed and prepared in order to offer a nicer outlook.
This file is licensed under Creative Commons Attribution ShareAlike 1.0 and Creative Commons "Attribution ShareAlike 2.0 France" Licence, December 17, 2004 by David Monniaux. (See Creative Commons Attribution 2.0 License.)

Editor's note: In many parts of the world, the varieties of dairy cattle usually raised seem to have something similar to the fowls' "pecking order", a sort of hierarchy in which one cow in each herd is established as more or less permanent leader (whether by self-appointed usurpation or unanimous unspoken agreement of the rest is not clear). In any case, that's the one the farmer puts the bell on, because if he needs to find the herd, he only needs to find that one and the rest will almost invariably be there. This has led to the expression in some cultures of calling anyone who wants to monopolize things: "The Bell Cow".