Forest tent caterpillars, like this one resting on an aspen leaf, are found in U.S. hardwood forests. A new study finds that when carbon dioxide levels are higher, herbivorous insects eat more vegetation.
courtesy of John Couture, UW-Madison
Pigeons weigh danger, stability and efficiency in the aerial acrobatics they use to avoid obstacles, study shows.
Courtesy of C. David Williams
More than half of Earth’s land surface has seen major changes in plant growth patterns such as leaf-on date and how much vegetation grows in a season.