Animal: Cow

Cows occur in most grassland or wooded biomes, cows will drop raw beef and/or leather when killed.  If killed by flame or fire; cooked beef will be dropped.

cow_pen

Cows can be breed with the use of wheat (right-click) two or more cows in order breed a baby cow.  This is especially helpful when building a fenced in herd of cows.

Animal: Chicken

Chickens occur randomly in most biomes within Minecraft, chickens when killed will drop raw chicken and/or feathers.  If a chicken is killed by flame, it will drop cooked chicken.

chicken_live

Chickens drop Eggs at random while active in Minecraft, eggs is an ingredient to make a Cake.  Eggs can also be thrown (right-click) but do no damage to any mob or player that may be hit by them.  There is 5-15% chance that when an egg breaks on the ground; a baby chicken may hatch.