Red wigglers from the Us are what we here in the uk call tiger worms, and as far as I know are the same, mainly due to the clearly visible yellow bands they have.
They also secreet a foul smelling toxic substance.
Notice the coloration, they are often used to compost, because, as it has been said before they like to stay local.
I think these are the thiaminase containing type.
As far as im aware the earthworm is not toxic, but don't take my word for it.I often use them to supplement a mouse diet as a snack. They are noticably larget than red wigglers , and they do not smell.
They are also able to crawl long distances and are often found crawling accross my lawn.
Hope this helps