Nightcrawlers are a form of earthworm. Prized primarily for use as fishing bait, nightcrawlers are generally known as either Canadian or European (more often than not, "Belgium"). Canadian nightcrawlers are the larger of the two, measuring up to 14 inches (35.6 cm) when fully extended. Fishermen enjoy the Canadian worm more because of its size. It can be easily secured to a fish hook, and stays lively while submerged in water for up to 5 minutes. The Canadian nightcrawler's used for catching la… (More on Nightcrawlers)