List of valid entities. Taken from bukkit.org

For an updated and compelte list, see http://jd.bukkit.org/doxygen/d5/d27/namespaceorg_1_1bukkit_1_1entity.html

Arrow
Blaze
Boat
CaveSpider
Chicken
Cow
Creeper
EnderCrystal
EnderDragon
Enderman
EnderPearl
EnderSignal
ExperienceOrb
Explosive
FallingSand
Fireball
Fish
Ghast
Giant
Item
MagmaCube
Minecart
MushroomCow
Painting
Pig
PigZombie
PoweredMinecart
Sheep
Silverfish
Skeleton
Slime
SmallFireball
Snowball
Snowman
Spider
Squid
StorageMinecart
ThrownPotion
TNTPrimed
Villager
Wolf
Zombie
