Are they the same as nightcrawler worms?
Worms are classified based on their eating and living requirements and habits. The name of a worm does not necessarily mean it is or isn’t a composting worm. Some composting worms have “nightcrawler” as part of their name. However, when people think of earthworms they usually mean the big garden nightcrawlers, which can be 8-10″ long and 1/2″ in diameter. These worms are not composting worms and are not suitable for use in your Worm Factory® composter. They like to live deeper in the soil and feed on subsoil and little if any decomposing matter. They will not adapt to living in the confines of a worm composter.
For more information on composting worms, see Vermicomposting Worms.