Oregon Giant Earthworm: 17 Facts You Won't Believe!

Oregon giant earthworm facts are intriguing

Considered to be an Endangered species by the International Union for Conservation of Nature (IUCN), the Oregon giant earthworm (Driloleirus macelfreshi) is an invertebrate residing mainly in the riparian forests. The species is not common and can rarely be sighted outside the range of the coastal states of Oregon. Conservation of the species is a matter of major concern simply because these earthworms are on the verge of becoming critically endangered and, ultimately, extinct. Since there is a dearth of specimens of the species, information about its life history could not be extracted. Also, intensive research could not be conducted to conclude upon all the threats associated with these worms. However, habitat loss along with the introduction of other species of earthworms have been considered a major threat to the population of the Oregon giant earthworms. Activities like clearing off areas for agricultural purposes, the introduction of toxic chemicals, setting up of industrial and housing units have adverse effects on the survival of the species. Moreover, the introduction of exotic, non-native earthworms of the Lumbricidae family has increased competition for food, thus rendering an endangered status to the Oregon giant earthworms.

If you enjoyed the content, then you can also take a look at some other intriguing facts about centipedes and giant African millipedes.

Oregon giant earthworm

Fact File

What do they prey on?


What do they eat?

Organic Substances

Average litter size?

Not Estimated

How much do they weigh?


How long are they?

up to 4.3 ft (1.32 m)

How tall are they?


What do they look like?

Pale White

Skin Type


What are their main threats?


What is their conservation status?


Where you'll find them



Oregon, USA





Scientific Name

Driloleirus macelfreshi





Oregon Giant Earthworm Interesting Facts

What type of animal is an Oregon giant earthworm?

The Oregon giant earthworm (Driloleirus macelfreshi) is one of the largest species of earthworm of the Megascolecidae family.

What class of animal does an Oregon giant earthworm belong to?

The Oregon giant earthworms belong to the class Clitellata, order Megadrilaceae.

How many Oregon giant earthworms are there in the world?

No records are available on the number of Oregon giant earthworms in current existence due to the lack of quantification. For this species of giant earthworm, Oregon is the only place they are found. The population trend of the species is also unknown.

Where does an Oregon giant earthworm live?

These earthworms are limited only to Oregon in the USA, unlike other worms that are found in soil around the world. However, as per recent records, the species has been traced in the Willamette Valley, Siuslaw National Forest, and Lane County. They also occur in the coastal range of Oregon, namely Benton County, Yamhill, Linn, Polk, Lincoln, and Marion counties.

What is an Oregon giant earthworm's habitat?

The Oregon giant earthworms prefer richly textured, deep, undisturbed soils in moist and damp areas where they have the provisions of ample mud and clay. Although they are quite tolerant towards acidic soil, it is challenging for them to thrive in waterlogged regions.

Who does Oregon giant earthworm live with?

Generally, earthworms are known to move in herds where each group moves in the same direction. Nevertheless, the social behavior of the Oregon giant earthworm is yet unknown.

How long does an Oregon giant earthworm live?

The giant earthworms generally live up to five years, but no such inferences can be made in this case as very little information is available about the life history of this rare-to-find species.

How do they reproduce?

Like all other earthworms, the Orgon giant earthworms are hermaphrodites. These organisms possess both reproductive organs needed for the breeding process. However, it's a curious matter to know that even after having the self-reliant and inherent power to procreate, they are unable to produce offspring without a partner! These earthworm pairs compete among themselves to ensure that the other is inseminated with the sperm, which then results in the fertilization of the opponent's eggs.

What is their conservation status?

As per the records of the International Union for Conservation of Nature (IUCN) Red List, the Oregon giant earthworms have currently been classified among one of the most Endangered species of earthworms. This is perhaps because of habitat loss and diminishing forests. As a result, the Oregon giant earthworm extinct risk is quite high.

Oregon Giant Earthworm Fun Facts

What do Oregon giant earthworms look like?

Oregon giant earthworm facts are all about the rarest species of giant earthworm found in soil.

*Please note that this is not an image of the Oregon giant earthworm but a Lumbricus rubellus earthworm from the same class. If you have an image of the Oregon giant earthworm, please let us know at

Considered to be one of the largest earthworm species in North America, the Oregon giant earthworms possess a distinct pale, whitish body color. Eeach body segment contains innumerable nephridia. The clitellum is located somewhere around segment 13, extending up to segment 22.

How cute are they?

The majority of the human population finds any species of earthworm gross, and the Oregon giant earthworm is no exception to this perspective. A handful of people would find this soil-dwelling worm cute. However, there are some species like the silkworm and the bearded fireworm that are really eye-catching.

How do they communicate?

Earthworms have a unique way of expression. They are heavily dependent on their senses for establishing communication. Generally, they are highly receptive to taste and touch. They can even anticipate approaching footsteps or predators by sensing vibrations. The earthworms are also capable of feeling moisture or sunlight in the surrounding atmosphere.

How big is an Oregon giant earthworm?

The length of an Oregon giant earthworm goes up to 4.3 ft (1.32 m) while it is about 1 in (2.5 cm) wide. Some specimen might be a little less than 3ft (0.91 m in length). The species is larger than most earthworms in the world and almost 10 times bigger than flatworms.

How fast can an Oregon giant earthworm move?

On average, the species of giant-sized earthworms have the potentiality to move at an average speed of 240 ft/hr (2 cm/sec). Specific details about the Oregon giant earthworm's speed range remain a mystery due to the lack of analysis and observation about the species.

How much does an Oregon giant earthworm weigh?

Oregon giant earthworms are perhaps the largest among all the identified species of giant earthworms. The weight of these worms has not been determined.

What are the male and female names of the species?

Earthworms are known to be hermaphrodites, which implies that these worms have the reproductive organs of both sexes inbuilt in their bodies. Hence, they are just regarded by their common name.

What would you call a baby Oregon giant earthworm?

The baby of an Oregon giant earthworm is commonly referred to as a hatchling.

What do they eat?

The diet of the soil-dwelling Oregon giant earthworms mainly compromises organic matter such as bits and pieces of wood, stems, grass, seeds, moss, decomposed conifer needles, and similar substances. These worms are also known to feed on dead insects occasionally.

Are they poisonous?

The earthworms are themselves not poisonous or venomous to humans or other animals. However, since the earthworms dwell on land, they might imbibe toxicity from contaminated soil. They can prove to be carriers of pathogens causing dangerous diseases and infections, namely salmonella and E. coli. Therefore, it always better to maintain a safe distance from earthworms.

Would they make a good pet?

The Oregon giant earthworm is usually not kept as pets as they cannot be traced easily. Moreover, keeping them as pets would be extremely unethical given that the species shares an endangered conservation status. Rather ensuring a protected natural habitat for their unchallenged survival would aid in increasing its population.

Did you know...

The Oregon giant earthworms emit a lily-like fragrant scent.

This land-dwelling species digs its burrows in deep, little disturbed soils in moist and damp regions where the soil is enriched by thick forestation.

Earthworms do not possess lungs, but they do require oxygen for respiration. Since these earthworms remain in close contact with land surfaces, the oxygen present in the soil is transmitted through their body. After absorbing oxygen from the moist soil, the dorsal blood vessels carry the oxygen to the five aortic hearts. The oxygen is then distributed to all other organs by the ventral blood vessels, and this cycle continues in a loop. So, if the soil within their habitat range is too full of moisture or if the soil is too dry, these worms would perish.

If you are wondering if giant earthworms are real, then you must be flabbergasted to know that there exist some species of earthworms that are actually bigger in the length of a human being! Yes, this is a fact. The giant Gippsland earthworm native to Australia is known to be bigger than human beings. These giant worms eat roots and soil organic matter.

What is the largest earthworm ever recorded?

Microchaetus rappi, endemic to South Africa, is the largest recorded earthworm in the entire world. According to historical data derived from a specimen in 1967, the size of the giant was recorded at 21 ft (6.7 m). This giant earthworm was traced on a road in Alice and King William's Town.

Are earthworms becoming extinct?

Earthworms are vital contributors to the ecosystem as they feed on dead organic matter, breaking them down into fragments and catalyzing the process of decomposition. Any soil replete with earthworms is likely to have high amounts of fertility. In general, earthworms are minute and fragile organisms where even an unconscious stamp of the foot is enough to erase its life. They already have a precarious status in the surrounding nature where these worms have to put up with a lot of adversity. To top that, several uncontrolled human actions have led to the destruction of the habitat of these harmless creatures. For instance, according to the stats and data released by the International Union for Conservation of Nature (IUCN), Oregon giant earthworm has been categorized among the Endangered species, which means that the status of earthworms is quite vulnerable in the current context. The giant Gippsland earthworm is another Endangered species. To enhance the conservation status of earthworms, adequate measures must be taken to ensure that the habitat of these worms is secured from potential threats. However, not all earthworms are threatened, as there are many earthworms that are quite abundant in their geographical habitat.

Here at Kidadl, we have carefully created lots of interesting family-friendly animal facts for everyone to discover! For more relatable content, check out these glow-worm facts and earthworm facts pages.

You can even occupy yourself at home by coloring in one of our free printable oregon giant earthworm coloring pages.



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