In This Issue [This Week in PNAS]

Bison engineer forage green-up Bison migrate and graze in Yellowstone National Park. Image courtesy of the US National Park Service. The Green Wave Hypothesis states that migrating herbivores follow the progression of young vegetation greening up from low to high altitudes or latitudes, given that young vegetation provides superior forage....

Source: Proceedings of the National Academy of Sciences - December 16, 2019 Category: Science Tags: In This Issue This Week in PNAS Source Type: research