
Skeletons are everywhere they burn in the sun. Spawners are found under ground.

This is a spider. Does not burn in sun. Spawners under ground as well.

This a cave spider found in strong holds when found watch out when they hit they poison you. When found it has tons and tons of webs around the spawners.

This a creeper they will blow when threatened or your playing on survival or hardcore settings. There are no spawners
dungens unless your
This is a wither skeleton usually found at the nether in fortress. When killed you get their head to make the wither boss. They also drop coal, stone swords and bones.

Zombie Pig men are in nether. they are hostile mob until attacked all the player they will all gang up on you from left and right.

Zombie's are really easy to kill. Same as the skeleton's they do burn in the sun. With new version coming out or when you read this if 1.4.8 comes out when the zombies burn when you get hit they will set you on fire as well so make sure you have fire resistant.

This is a enderman he can be friendly (frenderman) but when looked at in the eyes they will attack but here's a hint if your wearing pumpkin on your head he will not attack if you look him in the eyes and did you know these creatures are 3 blocks high and one more hint make sure when your in the end these ender are everywhere so make sure you have a pumpkin.