What characteristics do bulls have?

Answer 1

A large muscular crest over the neck (in addition to a thick, powerful muscular neck), a broad forehead, large size relative to their female counterparts, a sheath on the belly and a pair of testicles incased in a scrotum between the hind legs. Those are the primary characteristics one should see when identifying a bull or even telling a bull apart from the cows.

Note: not all bulls have horns and bulls are as colourful and varied in coat colorations as cows are. They also come in a variety of breeds, the same number of possible breeds (with the same names, like Holstein, Angus, Spanish Fighting bull, Texas Longhorn and others) as cows come from. Bulls are male, cows are female.