Scientists studied the nests in depth.
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There were, of course, leaf structures in the nest which means there probably was a wooded area nearby with maybe a river or stream.
So the tar pits must have been a moist area with a lower elevation during the Pleistocene.
From this study, they determined that leaf cutter bees live/lived in moderately moist climate.
And since there is a relative of the prehistoric leaf cutter bee still alive, scientists are studying the modern bee’s habitat.
Many insects live in a pretty limited area.
This eventually became stuck in the tar.
These prehistoric bees had their nests in the ground.
The modern leaf cutter bee has its nest in tube-like structures that have rotted wood they can easily dig through.