Observations of interlocked Swifts Apus apus and A. affinis

• Main Authors: Reuter, T., Nedstam, B., Ruotanen, T.-O.
• Format: Article in Journal/Newspaper
• Language: English
• Published: BirdLife Finland 1980
• Subjects: Apus apus
• Online Access: https://ornisfennica.journal.fi/article/view/133045