Cow

Cows are passive mobs that spawn in the overworld. They have a 2.5 health. They drop 1-2 Raw Beef and 0-3 leather when killed. They can also be milked by pressing and holding a bucket on them.

Breeding
Cows will be attracted towards equipped Wheat and if the player holds down the wheat onto adult cows, they will enter love mode. If he/she does the same to another cow, they will breed.

Trivia

 * Cows were first added to MCPE in 0.3.0.
 * The Raw Beef they drop can be cooked in a Furnace.
 * Cows started dropping Leather in 0.6.0, therefore making it possible to craft leather armor.
 * A variant of the cow, Mooshroom, were added in the 0.9.0 update. When sheared they will become cows and drop multiple mushrooms.
 * It's useful to make a farm of cows because they drop meat and leather.
 * Cows still make the old noises in MCPE.
 * Bug: Baby Zombies spawn on Cows, creating Cow Jockeys.

spawn egg
Vaca