Look to penguins to track Antarctic changes
Shifts in food webs and climate are written in penguin feathers and eggshells
![Gentoo penguin](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/02/021318_CG_penguins_feat2.jpg?fit=860%2C460&ssl=1)
FOOD TRACKER A new tool could help scientists distinguish between dietary changes in Gentoo penguins and changes that originate lower in the food web.
Kelton McMahon