Can a Leopard Gecko Eat Earthworms?

Can a leopard gecko eat earthworms? Yes, a healthy one can eat them as an occasional treat. The worms must be cultured or bought from a bait supplier, never dug from a yard.

Earthworms are not a staple. The main diet should stay with gut loaded insects, which the leopard gecko diet guide covers in full.

Can a Leopard Gecko Eat Earthworms Safely?

The leopard gecko (Eublepharis macularius) is an insect eater. Its natural prey includes scorpions, centipedes, spiders and beetles, and captive animals mostly eat invertebrates, according to Animal Diversity Web. That makes a worm an acceptable food, though not a typical one.

Evidence is thin on both sides. The University of Liverpool veterinary sheet for this species lists crickets, locusts, cockroaches, mealworms and superworms as suitable prey and does not mention earthworms. The Merck Veterinary Manual does list earthworms among common feeders for insect eating reptiles, alongside crickets, locusts and mealworms.

So the honest answer is a qualified yes. A leopard gecko can eat earthworms from a clean, known source as a change of pace. They are a poor choice as the main food, and the risks below explain why the source matters more than the species of worm.

Earthworm Nutrition Compared With Other Feeders

Merck publishes a composition table for reptile feeders. For earthworms it lists 22% dry matter, so roughly 78% of the worm is water.

It also lists 49.9% protein, 5.8% fat, 0.59% calcium and 0.85% phosphorus. The table does not state whether those are dry matter values.

The table does not name the worm species. These are general reptile feeder values, not measurements in leopard geckos.

The calcium to phosphorus ratio is the useful number here. Reptiles need more calcium than phosphorus in the diet, and Merck lists earthworms at 0.69, the highest ratio among the common feeders it compares.

Source for the table: Merck Veterinary Manual, general reptile feeders, life stage not given. Even the best ratio is still below 1:1, so earthworms still need calcium dusting. The calcium supplement guide explains which products fit.

Other data comes from research on animal feed, not reptiles.

In one thesis on air dried worms fed to chickens, Eisenia foetida contained 60.63% crude protein and 6.9% fat. Lumbricus terrestris contained 55.75% protein and 4.0% fat, per the Edinburgh Research Archive record.

Those are dry weight numbers from poultry research. They only show that worms are protein rich and moderate in fat.

A 1998 survey of whole invertebrates found that earthworms had the lowest total nitrogen of the samples, at 5.2% of dry matter. Vitamin A was low or undetectable across the group. A Wageningen University review of cultured feeder insects reaches the same point: little vitamin D and almost no preformed vitamin A.

No published study measures how a leopard gecko uses the vitamins, minerals or fat in earthworms. The practical reading is simple. Worms are moist, protein rich, lower in fat than waxworms, and not complete on their own.

Nightcrawlers vs Red Wigglers

Most keepers use the word nightcrawler for Lumbricus terrestris, a large worm sold at bait shops. Red wigglers are Eisenia fetida, a smaller worm sold for composting and fishing. The Merck table does not separate the two, so no authoritative source ranks one above the other for this gecko.

Size is the real difference. A nightcrawler can be several inches long, so it must be cut into pieces. A red wiggler is slimmer and shorter, which suits a juvenile better.

Keepers often report that red wigglers release a bitter, smelly fluid and that some geckos refuse them. There is laboratory support for caution.

A 2001 study in Comparative Biochemistry and Physiology Part C tested the coelomic fluid of Eisenia fetida. It was toxic to vertebrates but not to invertebrates.

That study did not test lizards, and no veterinary source reports poisoning in a gecko. Still, it is one more reason to treat red wigglers as the lesser choice. If a gecko refuses one species, try the other or drop worms altogether.

Where the Worms Come From

Buy worms that were raised for sale. Bait shop nightcrawlers and cultured red wigglers are the usual choices, and a pet supplier that breeds feeders works as well. Keep them cool in clean bedding and use them within a few days.

Never feed worms dug from a garden, lawn or compost heap. Soil dwelling worms can carry parasites and soil chemicals. A lawn treated with pesticide can poison a small reptile.

Merck, writing about reptiles generally, notes that parasites of prey items may turn up when infected prey are fed. It also notes that feeder crickets can pick up coccidia oocysts from feces.

Wild prey adds unknown exposure on top of that, and the leopard gecko health page lists the signs of illness to watch for.

Worms also hold soil in their gut. Many keepers rinse a worm and snip it open to let the contents out before feeding. That step is common keeper practice, not a sourced requirement, but it is cheap and it lowers the chance of feeding grit.

How to Feed Earthworms

Cut the worm into pieces no wider than the space between the gecko’s eyes. Hold a piece in feeding tongs and wiggle it near the nose, since a moving target triggers the hunting response in a nocturnal animal. Offer worms in the evening, when the gecko is active.

Remove any uneaten pieces within an hour. Dead worms spoil quickly in a warm enclosure. Dust the pieces lightly with calcium first, the same way as for insects.

The table is common keeper practice, since no source gives a worm schedule for this species. Replace a normal feeder with the worm on that night. Do not add it on top of a full meal.

Risks of Feeding Earthworms

The main risks are parasites and chemicals from wild worms and poor calcium balance when worms are overused. A gecko can also learn to refuse insects.

Moist, soft food can also loosen stool in some animals. Because worms are mostly water, a gecko that fills up on them takes in fewer calories and nutrients than the same weight of insects.

Calcium and vitamin D matter most. Merck notes that calcium or vitamin D3 deficiency, often from poor lighting and low calcium diets, leads to secondary nutritional hyperparathyroidism in reptiles. Worms do not fix that problem, so supplementation and correct lighting still apply.

Watch for signs of trouble after any new food. These include refusing meals, runny stool, weight loss and lethargy. Call a reptile veterinarian if signs last more than a few days.

What to Feed Instead

A leopard gecko does best on a base of appropriately sized crickets, locusts, cockroaches and mealworms, with waxworms and superworms as limited treats. The feeder insects guide compares the options in detail. If the aim is variety, worms are one option among several, not a requirement.

For a wider view, the gecko diet page covers feeding across gecko species, and the lizard feeding overview shows how diets differ between lizard groups. The main leopard gecko page links to every care topic.

Frequently Asked Questions

Can a leopard gecko eat earthworms every day?

No. Daily worms would crowd out insects that are better balanced for the animal. Keep them to a rare treat and keep the bulk of meals as gut loaded insects.

Can a leopard gecko eat nightcrawlers whole?

Not safely. A full nightcrawler is far too long for most geckos and can be hard to swallow. Cut it into small pieces first, then offer them one at a time with tongs.

Why can’t I feed earthworms from my garden to my leopard gecko?

Garden worms live in soil that may hold parasites, fertilizer or pesticide. A small reptile has little tolerance for those. Cultured or bait supplier worms are the safer choice.

Do earthworms need calcium dusting?

Yes, as a precaution. Merck lists earthworm Ca:P at 0.69, which is better than other feeders but still under 1:1. A light dusting of plain calcium fills the gap.

Are red wigglers toxic to leopard geckos?

Not proven in geckos, though a 2001 laboratory study found red wiggler coelomic fluid toxic to vertebrates. Keepers say some geckos dislike the taste, so offer a small piece first. Stop if the gecko spits it out or shows signs of illness.

What if my gecko refuses earthworms?

Do not force it. Many geckos prefer fast moving prey and ignore worms. Return to regular insects and try again a few weeks later, or leave worms out.