The main threats affecting Lepidoptera populations relate to habitat loss or inappropriate management. Many species, however, are becoming so rare or localized that uncontrolled collecting, particularly if targeted at vulnerable sites and species, might adversely affect populations and lead to local extinctions. In these circumstances, SABBA believes that care, consideration and restraint need to be exercised at all times, even when collecting is carried out for legitimate and acceptable purposes such as scientific research, the identification of difficult species or breeding programs used for butterfly wedding releases. In some situations specific byelaws prohibit the removal of specimens of flora and fauna from sites while many nature reserves, including private land controlled by either the land owner or SABBA, have a no collecting policy without prior permission, which will only be granted as a day permit and not a seasonal or annual permit. Legislation is also in place, which prohibits the collection of certain species. SABBA members are encouraged to report any obvious transgressions relating to unauthorized collecting to the appropriate authorities.