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originally posted by: Akragon
a reply to: Bloodworth
they usually either fly in, or drift on wind current..
Small enough critters will even come in with the rain droplets...
But most likely said critters were already in the wheelbarrow... from whatever you put in it previously
originally posted by: butcherguy
a reply to: Bloodworth
It sounds like you are observing mosquito larvae.
Adult mosquitoes lay their eggs in standing water. The larvae hatch and grow until they pupate into adult mosquitoes.