Its a server plugin called mob disguise.
Chat with our AI personalities
Shift
Minecraft 1.5 and earlier: Right Click Minecraft 1.6 and newer: Left Shift I am guessing you will be playing a new version, so press shift. If that doesnt work, right click.
Make The Girl Sleep in The Bed and Press Shift.
The shift click support always stays as shift and cannot be changed.
Hold shift to sneak to the edges of blocks without falling off.