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==Introduction==

==Introduction==

The species ''Gasterophilus'', is more commonly referred to as the 'Bot fly.'  It is an obligate parasite found on horses, donkeys, mules, zebras and elephants.   

The species ''Gasterophilus'', is more commonly referred to as the 'Bot fly.'  It is an obligate parasite found on horses, donkeys, mules, zebras and elephants.   

Eggs are laid on the body of the host and either hatch spontaneously or are stimulated to hatch through an increase in warmth and moisture from the animal self-grooming. They are laid in different areas according to species;

Eggs are laid on the body of the host and either hatch spontaneously or are stimulated to hatch through an increase in warmth and moisture from the animal self-grooming. They are laid in different areas according to species;

''G. intestinalis'' eggs are laid in the hair of the shoulders and fore legs. ''G. nasalis'' eggs are laid in the intermandibular area. ''G. haemorrhoidalis'' eggs are laid around the lips

''G. intestinalis'' eggs are laid in the hair of the shoulders and forelegs. ''G. nasalis'' eggs are laid in the intermandibular area. ''G. haemorrhoidalis'' eggs are laid around the lips

L1 are extremely small and motile, and begin development in the mouth, tongue and gums of the host.  The development of L1 into L2 occurs on the pharynx.  L2 then attaches to the base of the tongue and slowly migrates to the stomach.

L1 are extremely small and motile, and begin development in the mouth, tongue and gums of the host.  The development of L1 into L2 occurs on the pharynx.  L2 then attaches to the base of the tongue and slowly migrates to the stomach.