https://www.thestranger.com/slog/2018/07/19/29400164/study-of-seattle-crows-find-some-have-sex-with-the-dead
an appendix to pearlofcivilization.net
https://www.thestranger.com/slog/2018/07/19/29400164/study-of-seattle-crows-find-some-have-sex-with-the-dead