Shields, E. M., Rotella, J. J. and Smith, D. W. (2024) “Retrospective analysis of Trumpeter Swan Cygnus buccinator decline in Yellowstone National Park, USA”, Wildfowl, pp. 89–114. Available at: https://tidsskrift.dk/Wildfowl/article/view/161407 (Accessed: 13 February 2026).