BH Bird Nest Black - Bead Head. The Bead Head Black Birds Nest is an essential searching nymph which is extremely productive for Trout and many warmer water species, including Carp & Smallmouth Bass. Beadhead Black Birds Nest is a great Mayfly Nymph imitation. Used to great success by many fly fishermen in the Great Lakes region on both float and fly rod for spring and autumn Steelhead runs. If you havent tried Carp on the fly yet then you don't know what your missing this is a very popular method of fishing in Great Britain.