Came across this article/paper the other day. Pretty fascinating. 
https://science.sciencemag.org/content/368/6493/881
https://science.sciencemag.org/content/368/6493/881
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Bumble bees damage plant leaves and accelerate flower production when pollen is scarce
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downwardsfromzero
Boundary condition
Cool, they're pretty creative - they also nibble holes in longer flowers (such as my Salvia elegans ) in order to get to nectar that is otherwise out of their reach.
) in order to get to nectar that is otherwise out of their reach.