Hahn, Amnon, and Reuven Yosef. “Induced Alloparental Care in Common Swifts (Apus apus): Alloparental Care”. European Journal of Ecology 6, no. 2 (November 18, 2020). Accessed May 4, 2025. https://journals.ku.edu/EuroJEcol/article/view/14586.