Also, a note: In this piece, when I say menstruation, I’m referring to “overt menstruation,” where the lining is shed and then expelled from the body. Some people use the term “covert menstruation” to talk about animals that have “estrous cycles” and reabsorb their endometrium. --
Host, Writer, Editor, Animator Anna Rothschild
Additional Research and Writing Karishma Desai
Many thanks to Dr. Kathryn Clancy and Dr. Deena Emera.
Also, special thanks to Vanessa Hill, Joe Hanson, the entire PBS Digital Studios team for the awesome brainstorming session, Seeta Joseph, Allison Eck, Greg Kestin, and Jeffrey Wood.