Specialist or Class 3 permits are endorsement permits. Prior approval from the FPU is required in order to have species added to your permitted keeping list. Endorsements are usually given for individual species but are sometimes just given as whole genera or families. Experience and knowledge must be proven with similar related species or of general similarities between the basic species and the spelialist species in regards to husbandry. Two referees (people keeping the species or similar that you are applying for) must be sought that will willingly support you when you apply. They cost more than Basic permits per year but certainly are worth it.