The statement on Royal Mail's website says: "Certain living creatures are accepted only if enclosed in packs constructed so as to prevent injury to Parcelforce Worldwide staff, its agents or damage to other parcels. The following are accepted: bees; silkworms; leeches and certain parasites, destroyers of noxious pests, other insects sent to or from officially recognised institutions, mealworms, earthworms, caterpillars, ragworms, pupae and chrysalides, lugworms, maggots and fish fry and eggs. To send any of the above, Parcelforce By 9am, 10am, by noon or Parcelforce 24 services must be used."