An Indian worker makes a roll of the kite thread being prepared on a roadside on the outskirts of Amritsar, India, 24 November 2020. The kite string or the “Dor”, in the local language, is made of crushed glass, glue, colors, and egg to make it strong enough to hold the kite. (Photo by Raminder Pal Singh/EPA/EFE)

View of an egg fried on the pavement in Pozo Hondo, Santiago del Estero, Argentina on January 23, 2016, while the real feel was 57 degrees Celsius. Pozo Hondo's Mayor Claudio Nicolau fried an egg on the pavement of the main square of the city Saturday. (Photo by AFP Photo/Stringer)

Contestants of a tourism beauty pageant balance eggs on their collarbones as they cruise along the Yellow River in Jiyuan, Henan province, China, June 22, 2015. The contestants believe that if they are slim enough, their collarbones will allow them to balance the eggs securely on their bodies. (Photo by Reuters/Stringer)

A goose sits atop eggs in a flower bed on the Wisconsin Ave. bridge, Friday, April 19, 2013, feathers ruffled in the cold blowing wind and snowflakes. The goose is near to the statues dedicated to Gertie the duck who made international news when she built her nest next to the same bridge in 1945 and captured the attention of Milwaukee at the end of the war. A statue commemorating “Gertie the Duck” sits on the other side of the bridge. The goose has several eggs she is sitting on. (Photo by Mike De Sisti)

A woman looks at traditional Ukrainian Easter eggs “Pysanka”, installed as part of the upcoming celebrations of Easter, in central Kiev, Ukraine, April 29, 2016. A pysanka is a Ukrainian Easter egg, decorated with traditional Ukrainian folk designs using a wax-resist (batik) method. The word pysanka comes from the verb pysaty, “to write”, as the designs are not painted on, but written with beeswax. Many other eastern European ethnic groups decorate eggs using wax resist for Easter. These include the Belarusians, Bulgarians, Croats, Czechs, Hungarians, Lithuanians, Poles, Romanians, Serbs, Slovaks, Slovenes and Sorbs. (Photo by Valentyn Ogirenko/Reuters)

A woman jumps on a giant fried egg art installation as part of “Hecho en Casa” (Made at home) urban artwork festival in downtown Santiago, Chile, November 8, 2016. (Photo by Pablo Sanhueza/Reuters)

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.