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*Pigeons have epithelial cells in their crop sensitive to prolactin which slough when chicks (squabs) hatch producing crop milk
 
*Pigeons have epithelial cells in their crop sensitive to prolactin which slough when chicks (squabs) hatch producing crop milk
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*Owls have no storage facility in their crops, so produce a pellet of indigestible material after every meal
     
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