Cow

Cows are passive mobs,

Natural generation
Cows spawn on grass in herds of 4–10, at light level of 9 or more, on top of opaque blocks with at least 2 blocks of free space above.

Baby cow


If cows are given wheat, their love mode will be triggered and they will pair off to create calves, which may grant the player a small amount of experience. The parent cows will then have a delay of 5 minutes before they can breed again.

The growth of baby cows can be slowly accelerated using wheat. Each use takes 10% off the remaining time to grow up.

Other
Shearing a Mooshroom will turn it into a cow.

Drops
Adult cows drop 0-2 leather, 1-3 raw beef (steak if killed while on fire) and 1-3 experience.

Cows can be milked by a bucket on it.

Like with other baby animals, killing a calf drops nothing.

Behavior
Cows are 1.6875 blocks tall, 0.625 blocks wide, and 1.5 blocks long.

Cows tend to walk around slowly and aimlessly, mooing and breathing occasionally. They also tend to jump off high cliffs and make no attempt to stay out of water. During a rain or thunder storm, cows can be seen taking cover under structure or trees to avoid getting wet.

A cow will follow the player if he/she is holding wheat, even if attempting to do so could prove deadly to the cow.

If attacked, they will jump wildly and emit a cry of pain before trying to flee by running around erratically. Shortly after, the cow will become calm again and resume its idle wandering.

In the Console Edition, cows are unaware of cliffs and holes in the ground, leading to them occasionally fall and die from excessive fall damage, if not fall in lava or mob traps.

Trivia

 * Cows resemble Norwegian red cattles.
 * Cows in the PC Gamer Minecraft Demo are branded with a 'PCG' logo on their side.
 * Notch stated in a tweet that all breedable peaceful mobs displayed traits of both genders and could breed with any other individual of their species. This also applies to cows, since they have horns and give milk (although some cow females of certain breeds do have horns).