Thanks for the tips Belchion - I completely agree that it's a good idea to research your monsters. Using them exactly as described in the monster manual will lead to them being nothing more than a series of numbers for your players to role dice against. Thinking about how the monsters behave and how they are unique leads to much more interesting encounters. I once adapted a monster to make it invincible unless it was pushed into a nearby river - the player's got a lot more satisfaction out of realising that and succeeding in the mission than if they had just kept rolling damage on it.