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Bumble bees are in decline around the world due to agricultural pesticide use, disease, and human encroachments on their habitats. (Photo: Claire Carvell)

Across the temperate regions of the world, bumble bees are crucial pollinators of wild flowers, transferring pollen and helping to ensure genetically diverse plant populations.  (Photo: Adam Vanbergen)

Honey bees, managed for honey production and crop pollination services, are threatened by parasites and fungal and viral pathogens, and by the effects of land-use intensification. (Photo: Eugene Ryabov)

Certain bumble bee species and some solitary bee species are increasingly being domesticated and managed by humans to provide pollination services for agricultural crops like apples or strawberries. (Photo: Claire Carvell)

Pollination of wildflowers and crops is done by a huge variety of insect species including social honey and bumble bees, solitary bees, wasps, flies, beetles and moths. Their diversity helps ensure the healthy function of ecosystems. (Photo: Adam Vanbergen)

Hoverflies, like bees, help pollinate food crops and wild plants and face multiple threats. (Photo: Adam Vanbergen)

The Varroa mite is a major threat to honey bee colonies. It feeds on the 'blood' of the insects and in the process transmits many different types of harmful virus. (Photo: Eugene Ryabov)

Wild habitat networks in intensively farmed landscapes help to provide the food and nesting resources, which sustain pollinator populations and buffer them against disease and climate change. (Photo: Claire Carvell)

Flies forage widely across landscapes and may provide a substantial pollination service to wild plants and crops. Compared to bees, however, they are poorly studied. (Photo: Adam Vanbergen)

Wildlife biologists, working with colleagues from disciplines as diverse as mathematics, neuroscience, molecular biology, epidemiology and economics are studying the causes and consequences of insect pollinator decline and what we can do to arrest this loss of beneficial biodiversity. (Photo: Claire Carvell)

In some regionsof the world, bee farmers often must transport their bee hives long distances to supply economically important pollination services to agricultural crops like fruits and vegetables. (Photo: Eugene Ryabov)

Bumble bees live in a colony with a queen bee that produces the offspring. Lack of flowers in the nest vicinity and exposure to pesticides threatens the colony's ability to feed their young and produce new queens. (Photo: Matthias Furst)

Beekeepers in Sofia, Bulgaria, hold an Earth Day protest demanding the suspension of the usage of neonicotinoid pesticides linked to the death of bees worldwide. (Photo: Reuters)

A new laboratory was established in Jordan to protect bees from infectious diseases following an outbreak that decimated nearly half of the region's bee hives in 2008. (Photo: Reuters)