It very much depends on which of the 1500 species of earthworm it is, but the smallest is less than 1 mm and the largest, the Australian Giant Gippsland Earthworm, can be up to 11 feet. The longest worm on record was 13 feet long. Ew.
The common earthworm, the lumbricus terrestis, usually only gets to 9 or 10 inches.
I found some pictures of the Gippsland earthworm. “Perhaps the largest overall known species is the giant Gippsland earthworm (Megascolides australis) ~ seen above, which is found only in the Bass River valley of South Gippsland in Victoria, Australia. These huge worms regularly reach sizes of 3 meters (10 feet), and the longest specimen on record was measured at 4 meters (14 feet) long. These rare earthworms are so large that it is possible to hear the gurgling sound of their movement through the earth when they are disturbed.” (Link below).
The largest earthworm in the world is the Giant Gippsland Earthworm. It reaches about a meter long! This worm lives only in Victoria, Australia, and lives primarily underground. They’re endangered, but definitely considered to be the world’s largest earthworm.
Earthworms come in all sizes, ranging from about 1 millimeter to about 3 meters long. They have smooth bodies that are made up of rings (annuli). They tend to be reddish-brown and are also known as night crawlers.
You don’t have to go all the way around the world to find giant earthworms. It didn’t compare to the meter long variety, but I was shocked to find one that was a foot long in Cambridge, Massachusetts.
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