Selenium in Ecosystems: Sibling Stilt Embryos

Sibling stilt embryos collected from a single nest on the same day from a Tulare Basin evaporation pond in 2001. The overtly teratogenic embryo on the left, exhibiting stunted growth, no eyes, deformed bones (in right foot) contained 72 ppm Se (dw, whole egg), while the overtly normal sibling, on the right, contained 16 ppm Se. (photo courtesy of USFWS)