Enderman

Endermen are mysterious black figures that come from The End. They have the ability to teleport and have a whopping 20 hearts of health. The  damage levels are listed below:

Easy: 2 hearts of damage

Normal: 3 and a half hearts of damage

Hard: 5 hearts of damage

Drops:

0-1 Ender Pearl(s)

5 experience points

They are 3 blocks tall instead of the regular 2. They are neutral mobs, which means they will not attack you unless provoked. Some people may call them, well, HIGHLY, HIGHLY sensitive. They can be provoked if hit, but also can be provoked by merely being looked at. When looked at, an Enderman will stand still with its mouth open, trembling and screaming.

Those are pictures of an angry and a neutral Enderman. Enderman can be found in very large quantities in The End biome. In the Overworld, Enderman spawn 10x more rarely than other mobs.