Plankton in the Sky?
"Why would there be more insects and spiders floating in the air during daytime
than at night?"
During the day, the sun produces thermal air currents that can hold many things aloft.
Thermals are strong enough to hold up huge hawks and eagles as they migrate, so they
can certainly hold up a tiny insect or ballooning baby spider! Also, winds and updrafts
are much stronger in the daytime than at night, making it a breeze for more insects
and spiders to float away.
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