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Stage one
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The parasite(heel fly or cattle grub) lays eggs on the hair of the animals hind legs, flanks,or sides
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Stage two
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The eggs hatch and the larvae burrow into the skin
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Stage three
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The larvae migrate through the body to the hosts back, where they make a hole for breathing
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Stage four
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The mature larvae emerge through the hole and drop to the ground
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Stage five
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The adult fly emerges from the larvae
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Stage six
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The cycle begins again
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