La Brea Tar Pits yield exquisite Ice Age bees

Ancient pupae snug in leaves give clues to climate

NOW AND THEN  A pupa of a modern leafcutter Megachile bee female (left) has the same basic look as a Megachile male (right, CT scan) that is at least 23,000 years old, having been preserved in the La Brea Tar Pits.

A.R. Holden et al/PLOS ONE

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