---
title: "Insect anatomy in depth"
description: "Insect anatomy in depth: compound eyes made of thousands of tiny lenses, spiracles (breathing holes along the body), diverse mouthparts (chewing mandibles in beetles, sucking proboscis in butterflies,"
canonical: https://lightmysky.com/learn/science/insect-anatomy-in-depth-mt_Oz8yNPNtub
source: https://lightmysky.com/learn/science/insect-anatomy-in-depth-mt_Oz8yNPNtub.md
retrieved: 2026-10-19
---

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# Insect anatomy in depth

Insect anatomy in depth: compound eyes made of thousands of tiny lenses, spiracles (breathing holes along the body), diverse mouthparts (chewing mandibles in beetles, sucking proboscis in butterflies, sponging pad in flies), and moulting the exoskeleton to grow. Biomimicry — how engineers copy insect designs.

Subject: Science · Area: Insects & Minibeasts · Ages 9 to 11
Page: https://lightmysky.com/learn/science/insect-anatomy-in-depth-mt_Oz8yNPNtub

## Ready when they can

- Describe at least two specialised insect structures such as compound eyes or spiracles and explain their function
- Compare the mouthparts of a beetle (chewing) and a butterfly (sucking) and explain how each is suited to its food
- Give one example of biomimicry where human technology is inspired by an insect structure or ability

## Lesson: The hidden tools in an insect's body

Insects have body parts that work nothing like ours. Take an eye: yours has one lens, but a dragonfly's eye is built from up to 30,000 tiny lenses called ommatidia. Each lens sees its own narrow slice of the world, and the insect's brain stitches the slices together. That is why insects notice the smallest flicker of movement before you do.

Insects do not have lungs. Along the sides of the body are small holes called spiracles. Air passes through the spiracles into a network of thin tubes that carry oxygen straight to every cell, with no heart needed to deliver it.

**Example.** A beetle bites through a tough leaf with two hard mandibles that work like a pair of scissors. A butterfly has no mandibles at all. It drinks with a proboscis, a long tube that stays curled like a party blower until it unrolls into a flower to sip nectar. A house fly does neither. It presses a spongy pad onto its food and soaks up the liquid like a mop.

**Tip.** An insect's exoskeleton is hard and cannot grow with the insect inside it. So the insect builds a new, softer exoskeleton underneath, splits the old one open, and climbs out. This is called moulting, and most insects moult several times before they stop growing.

*(drawing: Moulting, step by step: a new shell grows underneath, the old shell splits open, and the insect climbs out. Its new shell hardens while it grows.)*

**Tip.** Engineers copy insect designs to solve real problems. Camera makers have built compound-eye lenses, modelled on an insect's thousands of tiny lenses, to give drones an almost all-around view in one shot. Copying an insect's body is often faster than inventing something from scratch.

**Recap.** An insect's body is built from specialised parts: eyes made of thousands of lenses, breathing holes called spiracles, mouthparts shaped for its food, and an exoskeleton it must shed to grow.

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Camouflage, warning colours, and mimicry](https://lightmysky.com/learn/science/camouflage-warning-colours-and-mimicry-mt_07Geg7LITa)
- [The insect body plan](https://lightmysky.com/learn/science/the-insect-body-plan-mt_oNWXXAn3cn)

## Opens up

- [Animal body plans: symmetry, cavities and the deep splits](https://lightmysky.com/learn/science/animal-body-plans-symmetry-cavities-and-the-deep-splits-mt_hEC72cvFQF)