Models wait backstage before the GUAXIN Autumn/Winter 2024 collection show by Chunlin Yang, during China Fashion Week in Beijing, China on March 29, 2024. (Photo by Tingshu Wang/Reuters)

Sporty Kendall Jenner shows her flexibility as she models Adanola's latest activewear collection on January 8, 2024. (Photo by Sean Thomas/The Mega Agency)

Models walk the runway at the Versace Pre-Fall 2019 Collection at The American Stock Exchange on December 02, 2018 in New York City. (Photo by J.P. Yim/Getty Images)

A model displays a creation for designer Andres Sarda's Fall/Winter 2015 collection, during the Mercedes-Benz Fashion Week in Madrid, February 7, 2015. (Photo by Javier Barbancho/Reuters)

A model is photographed backstage before he BCBG MAX AZRIA Fall 2015 collection is modeled during Fashion Week, in New York, Thursday, February 12, 2015. (Photo by Richard Drew/AP Photo)

A model presents a creation from the Tom Ford Spring/Summer 2015 collection during London Fashion Week September 15, 2014. (Photo by Suzanne Plunkett/Reuters)

A model wears a creation for Anthony Vaccarello's Spring/Summer 2015 ready-to-wear fashion collection, presented in Paris, Tuesday, September 23, 2014. (Photo by Jacques Brinon/AP Photo)

Sharon Beals is a San Francisco based photographer who has photographed nest and eggs specimens collected over the last two centuries at The California Academy of Sciences, The Museum of Vertebrate Zoology, and The Western Foundation of Vertebrate Zoology. While few nests are collected today, these nests and eggs are used for research, providing important information about their builder’s habitats, DNA, diseases and other survival issues.