The third-year doctoral student in biology is trying to solve why some species are in increasing danger of dying off while others thrive.

The third-year doctoral student in biology is trying to solve why some species are in increasing danger of dying off while others thrive.
The third-year doctoral student in biology is trying to solve why some species are in increasing danger of dying off while others thrive.
The third-year doctoral student in biology is trying to solve why some species are in increasing danger of dying off while others thrive.
Walker studies Poecilia mexicana, a species of live-bearing fish that have adapted to surviving in hydrogen sulfide-abundant waters, in the Tobler Lab.