Kritsov, S. K. and Mineyev, Y. N. (2013) “Daily time and energy budgets in Whooper Swans Cygnus cygnus and Bewick’s Swans Cygnus bewickii in the breeding season”, Wildfowl, pp. 319–321. Available at: https://tidsskrift.dk/Wildfowl/article/view/154948 (Accessed: 17 December 2025).