Eggshell thickness by part of egg

Graph showing how eggshell thickness varies at different parts of a bird egg, with the thinnest parts at the ends

Detailed Description

Mean eggshell thickness at 5 different equally spaced positions on Forster’s tern eggshells (n = 40). Eggshells studied were thicker at the egg equator than the ‘bottom’ and ‘top’ of the egg.


Peterson, SP, JT Ackerman, MP Herzog, MS Toney, B Cooney and CA Hartman. 2020. Avian eggshell thickness in relation to egg morphometrics, embryonic development, and mercury contamination. Ecology and Evolution.


Image Dimensions: 1183 x 1178

Location Taken: US