Relationship of Common Foxglove and the long-tongued Garden Bumblebee in the U.K.

Bombus hortorum visiting Common Foxglove

by Arthur Broadbent and Andrew Bourke

To understand the relationship between plants and their pollinators fully, it is important to know the  degree  to  which  plant-pollinator  systems  are  specialized.  For  example,  if  populations  of pollinators decline, plants that rely on just one or a few pollinating species for pollination will be more prone to extinction than plants with many pollinating species. 
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Read the scientific publication in JPE.