The joint study between Penn State and Pitt researchers shows that small differences in temperature within a farm field can affect how many bees it attracts.
Penn State researchers looked at 50 years of data on honey production as a way of measuring how the landscape of available flowers has shifted over that time.
It's not just honeybees that are feeling the pain of recent declines. For the first time ever, a bumble bee species has been added to the Endangered Species List.