Snow Golem

A Snow Golem is an upcoming mob which was first mentioned by Notch on September 21st, 2011 to appear in Beta 1.9. According to the tweets by Notch, a Snow Golem is a friendly mob. You will be able to craft Snow Golems, likely requiring the materials such as snow, coal, and sticks. Snow Golems will throw snowballs at enemy mobs and will melt in warmer biomes. As Snow Golems move, they leave a trail of snow on the ground.

Behavior
Snow Golems will not attack their creator. However, they will throw snowballs at hostile mobs, provoking them. This gives them an almost suicidal nature, because snowballs do no damage, but they attract enemies which can kill it or the player. It is unknown if Snow Golems will attack Passive mobs.

Trivia

 * Snow Golems are the first mob the player can create through the use of crafting.