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Red wigglers (Eisenia foetida or Eisenia andrei) are most often used in vermicomposting. Another species, called Lumbricus rubellus (i.e. red earthworm or dilong (China)), can also be used, however, they do not thrive in shallow compost bins as well as red wigglers do. European nightcrawlers (Eisenia hortensis), a.k.a. Belgian nightcrawlers, dendrobaenas or dendras, are also used in vermicomposting. However, such species as Lumbricus terrestris (nightcrawlers (US) or common earthworm (UK)) are not suitable, since these worms dig deeper than most compost bins could allow. Blueworms (Perionyx excavatus) can be used in areas with tropical climate. However, these cannot be used in compost bins in most of the neighboring United States. The species inhabit organic-rich soils in North America and Europe and prefer compost, rotting vegetation and manure piles. In some areas they are considered an invasive species. Since they don't burrow deep and their main source of nutrition is decomposing plant matter in the soil, they quickly acclimatize to live in the worm bin with food or plant waste for sustenance. One can purchase composting worms online, from mail-order sellers or fishing shops (here they are sold as bait). Worms can also be collected from their natural habitats - manure piles or compost. However, these species are not the same worms that live in ordinary soil or are found on pavements after the soil is flooded by rainwater.