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Zerg Defense

First, I'd like to say that this strategy is to stop small drops/air forces and medium to large land forces. First build some defense, such as Sunken Colonies and Spore Colonies on the edges of the base. Place Overlords to detect units in all areas and set them to hold position. Build Sunken Colonies at the choke point/s and in the base. A common mistake is not building any defense past the choke point and edges of the base. Leave about 20 burrowed Zerglings and hydras in the base, then, research Lurker Aspect. Morph the Hydralisks' into Lurkers and put them at the edges of the base near the Spore and Sunken Colonies. I highly doubt that the enemy will go much farther than the edges of the base, But...You also have reserve troops just in case they do get past the edges.