Pollinators are responsible for one of every three bites of food we take, according to the agency, but their numbers have been declining for many years.

U.S. beekeepers lost nearly 40% of their honeybee colonies in winter 2019, according to a survey by the Bee Informed Partnership.

Bee decline has many causes, including decreasing crop diversity, poor beekeeping practices and loss of habitat. Pesticides weaken bees' immune systems and can kill them. Varroa mites latch onto honeybees and suck their "fat body" tissue, stunting and weakening them and potentially causing entire colonies to collapse.