I think its wiggler not wriggler.=)
The scientific name of a red wiggler worm is Eisenia fetida . It is considered as the worm best for vermicomposting. They love darkness so they shy away from light. They have voracious appetites and can eat as much as half of their weight. They are also raised for fish baits because they wiggle on the hook attracting fishes and can survive in water for many days.
Nightcrawlers are also used for composting but they are not really the best choice for composting. They don't live well in high moisture and they might die if they live in a medium with high water content. But nightcrawlers are fat so they are also used for bait.
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