Milk Snail

otala lactea

The Milk Snail (Otala lactea), also known as the Spanish snail, is a highly adaptable terrestrial gastropod native to the Mediterranean basin. Renowned for its resilience, this species has successfully colonized various parts of the world, including North America and Bermuda, where it is often introduced through the pet trade or heliciculture. A fascinating aspect of its biology is its extreme drought tolerance; during dry, hot periods, it can enter a state of dormancy called estivation, sealing itself inside its shell with a mucus barrier to survive for months without active hydration.

Habitat: Found in dry, open habitats, including coastal scrublands, rocky hillsides, gardens, and agricultural fields where it clings to vegetation or rocks.

Appearance

The Milk Snail features a robust, globose shell measuring about 2.5 to 4 cm in diameter. Its shell coloration is highly variable but generally displays a milky-white or cream background adorned with five distinct chocolate-brown spiral bands and delicate speckled patterns. A key diagnostic feature is the mature shell's aperture lip, which is strongly reflected and has a striking dark brown to nearly black interior rim, contrasting sharply with the pale outer shell. The snail's soft body is typically a pale brownish-gray or cream color.

KingdomAnimaliaPhylumMolluscaClassGastropodaOrderStylommatophoraFamilyHelicidaeGenusOtala

Photo: Manuel CABALLERCC BY 4.0 · iNaturalistView original ↗

Milk Snail

Interesting facts

During courtship, milk snails shoot microscopic calcified 'love darts' into each other's bodies to inject hormones that increase the chance of successful fertilization.

Milk snails have been consumed by humans for millennia, as evidenced by massive prehistoric shell middens found in caves across North Africa.

They are simultaneous hermaphrodites, meaning every individual possesses both male and female reproductive organs, though they still require a partner to mate.

Special abilities

Secretes a tough, parchment-like membrane of dried mucus over its shell opening to lock in moisture during periods of drought.

Enters a deep metabolic sleep that can last for several months to survive extreme heat and dry conditions.

Produces a specialized slime trail that lubricates its path, allowing it to glide harmlessly over sharp objects like thorns and rocks.

Measurements & details

Length: 2+ cm
Weight: 0.005+ kg
Lifespan: 2+ years
Clutch Size: 50+
Incubation: 14+ days

Diet & Feeding

Feeds primarily on a wide variety of green plants, agricultural crops, and decaying organic matter.

Primary Foods

Clover
Cabbage
Decaying leaves
Lichen
Garden vegetables

Foraging Method

Grazing

Ecological connections

Eaten by

Rosy Wolfsnail

Euglandina rosea

A carnivorous snail that aggressively hunts and preys upon milk snails in overlapping territories.

Eaten by

European Hedgehog

Erinaceus europaeus

Forages in gardens and open woodlands, regularly consuming milk snails as a key food source.

Competitor

Garden Snail

Cornu aspersum

Competes directly for food resources, shelter, and breeding sites in garden and agricultural ecosystems.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

Collections for this object will appear here as more themes are added.

Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Milk Snail?

Compare body symmetry, shells, segments, legs, tentacles and how the animal moves. Invertebrates span many unrelated groups, so start with body structure. Invertebrate Identifier: upload a photo and compare the visible details.

How long is Milk Snail?

2+ cm

How much does Milk Snail weigh?

0.005+ kg

How long does Milk Snail live?

2+ years

What does Milk Snail eat?

Feeds primarily on a wide variety of green plants, agricultural crops, and decaying organic matter.

Where is Milk Snail usually found?

Found in dry, open habitats, including coastal scrublands, rocky hillsides, gardens, and agricultural fields where it clings to vegetation or rocks.

How does Milk Snail hunt?

Grazing