Bull trout are running out of time in Montana as their traditional waters heat up, biologists say. By moving more than 100 fish to higher elevations, fisheries scientists hope to save the species by seeding a new population in waters that will stay cooler longer. Jim Mogen/USFWS hide caption

itoggle caption Jim Mogen/USFWS

The debate about sustainable diets has focused on meat production, which requires lots of land and water to grow grain to feed livestock. It also contributes to methane emissions. But the Cabinet secretaries with final authority say the 2015 dietary guidelines won't include sustainability goals. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

A black-footed ferret looks out of a crate during a release of 30 of the animals at a former toxic waste site, now a wildlife refuge in suburban Denver. David Zalubowski/AP hide caption

itoggle caption David Zalubowski/AP

A team of blacksmiths, welders, artists and scientists have been working together in Canada to mount the T. rex bones without damaging them. Metal cradles hold 150 of the major bones precisely in place. Research Casting International hide caption

itoggle caption Research Casting International

Ken (left) and Henry were created using DNA plucked from a skin cell of Melvin, the beloved pet of Paula and Phillip Dupont of Lafayette, La. Edmund D. Fountain for NPR hide caption

itoggle caption Edmund D. Fountain for NPR

Dry conditions in California have limited the amount of pollen and nectar bees can collect. Ezra David Romero/Valley Public Radio hide caption

itoggle caption Ezra David Romero/Valley Public Radio