gatekeeper

noun

• 1 (also gateman) an attendant employed to control who goes through a gate.
• a person or thing that controls access to something:GPs can act as gatekeepers, filtering demands made on hospital services

• 2an orange and brown European butterfly with small eyespots on the wings, frequenting hedgerows and woods. Also called hedge brown.

  • Pyronia tithonus, subfamily Satyrinae, family Nymphalidae