Hario, M. (1984) “Onset and pattern of primary moult in the Lesser Black-backed Gull Larus f. fuscus – a comparison with the Herring Gull L. argentatus”, Ornis Fennica, 61(1), pp. 19–23. Available at: https://ornisfennica.journal.fi/article/view/133143 (Accessed: 19May2024).