A warming climate is said to be favoring short-tongued bumblebees over
long-tongued bumblebees.

Puzzlingly, the study does not explain why a long tongue would be any
disadvantage in working "shallow" flowers that do not necessarily require
longer tongues.  One would think that a longer tongue would always be
useful.

http://www.sciencemag.org/content/349/6255/1541.full
http://tinyurl.com/ntk4sp8

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