The world’s heaviest insect weighs as much as a small bird. Even a giant cockroach can fit on your palm.
How to Play: Guess if the insect on the right is LARGER or SMALLER than the one on the left.
Name A
Name B
Top 10 Largest Insects
Insect size is measured by body length (head to abdomen tip), excluding antennae or wings. The largest insects today are far smaller than prehistoric giants.
| # | Name | Body Length (mm) | Unit |
|---|---|---|---|
| 1 | Giant Spider Crab leg-span (not insect) | 3,700 | mm |
| 2 | Goliath Tigerfish (not insect) | 1,500 | mm |
| 3 | Lobster (not insect) | 800 | mm |
| 4 | Giant Stick Insect (Phryganistria chinensis) | 640 | mm |
| 5 | African Goliath Frog (not insect) | 330 | mm |
| 6 | Giant Centipede (Scolopendra) | 300 | mm |
| 7 | Goliath Birdwing Butterfly (wingspan) | 280 | mm |
| 8 | Queen Alexandra's Birdwing | 280 | mm |
| 9 | Atlas Moth (wingspan) | 240 | mm |
| 10 | Giant Walking Stick (NZ Tree) | 220 | mm |
Insect Size Limits
Modern insects max out around 60-70cm body length (giant stick insects). They are limited by oxygen supply through tracheal tubes — bigger insects can’t get enough oxygen.
300 million years ago, atmospheric oxygen was 35% (today 21%). Giant dragonflies (Meganeura) had 70cm wingspans. When oxygen dropped, giant insects went extinct.
The Goliath beetle (West Africa) is the heaviest insect at 100g — about a small bird. The Titan beetle (Amazon) at 167mm is the longest beetle.
Frequently Asked Questions
Largest insect ever?
Living: Phryganistria chinensis stick insect at 640mm. Extinct: Meganeuropsis (dragonfly), wingspan 71cm.
Why don't insects get bigger?
Oxygen delivery via tracheal tubes limits scale. Larger size requires lungs (vertebrates) or different respiration.
How heavy can insects get?
Goliath beetle at ~100g is heaviest. Most giant insects are long but light.
Are spiders insects?
No — spiders are arachnids (8 legs vs 6 for insects). Spider species in this list are noted separately.
Note: Insect body length in mm per entomological references.
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