Cows are mobs in minecraft that say "MOO!" all day and all night. In alpha-1.8 they only dropped leather but in 1.8 + they dropped raw beef which could be cooked into steak. But Please dont kill cows they have feeling too grow your food dont kill.

Diamond if you would like to hear more mob storys

Also check out www.youtube.com/user/JordPrinceGaming?feature=mhee too see my minecraft videos and other games.