✨ Moulting (Ecdysis): The Most Dangerous Part of a Mantis’ Life

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Praying mantises are hemimetabolous insects — meaning they don’t undergo a full metamorphosis like butterflies. Instead, they grow through a series of moults, each one revealing a slightly more developed version of themselves.

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🦴 Why Moulting Exists: The Exoskeleton Problem

 

Insects wear their skeleton on the outside — an exoskeleton — which protects them but cannot stretch or grow.

Humans? Our bones grow with us, and we can add or lose fat and muscle as we please. Mantises don’t get that luxury.

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So evolution chose a dramatic solution:

When the skeleton no longer fits, throw it away and grow a new one.

Each new exoskeleton is pre‑written in their DNA, waiting to be inflated and hardened after the old one is shed.

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🔄 The Hidden Perks of Moulting

 

Although moulting is risky, it comes with remarkable advantages:

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• 🦿 Lost limbs can regenerate (usually within 1–2 moults if the mantis is still young).

• 🦗 Damaged antennae or raptorial arms can reform.

• 🍄 External fungal issues or deformities are shed with the old skin.

• ✨ A fresh, pristine exoskeleton emerges every time.

 

This is why juveniles often look “brand new” after each shed.

 

🔢 How Many Moults?

 

The total number varies by species and sex:

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• ♂ Males typically have fewer moults

• ♀ Females usually have more, as they grow larger and require more developmental stages

 

Most species moult 6–10 times before reaching adulthood.

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⏳ The Pre‑Moult Phase (2–5 Days)

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In the days leading up to a moult, your mantis will show clear behavioural changes:

 

🚫🍽️ Refusing Food

 

They may:

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• Ignore prey

• Kill prey but not eat it

• Drop food mid‑grab

 

Leaving live prey inside the enclosure at this time is dangerous:

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• 🕷️ Stress can delay or interrupt the moult

• 🩸 Prey can injure the mantis during ecdysis

• 💀 Internal injuries from stress can cause sudden death with no visible signs

 

Remove all uneaten prey promptly.

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👁️ Visual Stress: The Silent Killer

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Mantises must never be able to see each other — especially before a moult.

Even the sight of:

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• Another mantis

• A moving shadow

• A feeder insect pacing the enclosure

 

…can cause the mantis to abort the moult mid‑process, which is almost always fatal.

Opaque dividers or spaced enclosures are essential.

 

💤 Behaviour Before Moulting

 

Your mantis may become:

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• 🐌 Slower

• 🤏 Clumsy when handled

• 🧘 Less reactive

• 🧗 Drawn to the mesh lid

 

If you notice clumsiness or lethargy, return them to the mesh top immediately and leave them undisturbed for several days.

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🪂 During the Moult (Ecdysis)

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This is the most critical stage.

Your mantis will:

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• Hook its tarsal claws into the mesh or a grippable surface

• Hang upside‑down

• Slowly slide out of the old exoskeleton

 

⚠️ DO NOT DISTURB — UNDER ANY CIRCUMSTANCE

 

Any of the following can cause a fatal fall:

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• Sudden movement

• Vibrations

• Opening the enclosure

• Touching the mantis

• Adjusting décor nearby

 

A fall during ecdysis almost always results in:

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• Twisted limbs

• Crumpled wings

• Internal rupture

• Death within hours or days

 

This is the most delicate moment of their entire life cycle.

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🪽 The Final Moult (To Adulthood / Imago)

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When moulting into adulthood:

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• Wing buds appear as elongated sacs

• The mantis pumps haemolymph into them to expand the wings

• Wings unfurl and harden over several hours

 

This is mesmerising to watch — but the “no touching” rule becomes even more important.

 

⏱️ After the Moult

 

Your mantis will hang motionless for:

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• Several hours

• Up to 48 hours for larger species

 

During this time:

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• ❌ Do not feed

• ❌ Do not handle

• ❌ Do not move the enclosure

 

The new exoskeleton must harden fully.

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🎨 Colour Changes

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Freshly moulted mantises are pale, but they darken as they dry. Some species can change colour entirely after a moult — influenced by genetics, humidity, and possibly environmental cues.

 

🌿 In Summary

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• 🕊️ Keep the environment calm

• 🫥 Prevent visual contact with other mantises

• 🍽️ Remove all prey before a moult

• 🧗 Ensure strong mesh for hanging

• 🚫 Never disturb during ecdysis

• ⏳ Allow 1–2 days of recovery afterward

 

A successful moult is the single biggest factor in a mantis’ long‑term health.