Pollinators such as bees, birds and bats affect 35 percent of the world's food production, increasing the output of 87 of the leading food crops worldwide, finds a new study co-authored by a UC Berkeley conservation biologist. The study is the first global estimate of crop production that is reliant upon animal pollination. It comes one week after a National Research Council (NRC) report detailed the troubling decline in populations of key North American pollinators.