Instructions:

Two small clumps of black fur dubbing with black hackle in the middle makes a great ant imitation. 

Although there are many different materials used to tie ants, this is probably the most popular of all bodies.  However, with the introduction of foam flies, the reputation may soon change in favor of foam.   

Ants are found in abundance on trees and other overhanging vegetation and frequently fall or are blown into the water.  In some situations I've seen so many ants in the water that fish began feeding on them selectively, ignoring other insects.  

Anglers that don't fish ants should consider giving them a try because fish find ants an attractive menu entree.