DARKNUT
[Behavior] A much more intelligent, mobile knight than the Iron Knuckle. The Dark Nut marches around a room, following Link if he falls into its sights. Dark Nuts wear heavy armor and are immune to frontal attacks.

[Tactics] Hit them in the back or sides, which is clearly easier said than done. Strategies: hide next to a rock and when the Dark Nut passes it, quickly stab him in the side and run away. In later games, jumping over them or using the boots to run through them will get you a quick opening at their backs.

[Tidbits] Dark Nuts are oft confused with their "cousins", the Iron Knuckle. There is really nothing similar about the two other than they wear armor and are a pain in the rear to defeat.

DEKU SHRUB
[Behavior] Generally not the brightest creatures (despite their ability to build cities and appoint Kings...), a Deku Shrub will stay in a fixed point in a room and spit Deku Nuts at a target.

[Tactics] Use your shield to deflect the Nut back at them, which will force the weaker ones to admit defeat. The others will just be stunned, so go in for the kill.

[Tidbits] Dekus come in two varieties: Shurbs, as above, and Scrubs, which are the same, except don't bathe as often.