# Goliath Birdwing — Facts, Threats & Conservation

*Ornithoptera goliath (Deslisle, 1989) — family Papilionidae*

> The goliath birdwing (Ornithoptera goliath) is the second-largest butterfly in the world, with females reaching a wingspan of around 25 cm; its caterpillars sequester toxins from Aristolochia vines in the same way poison-dart frogs store alkaloids from their diet.

**IUCN status:** Least Concern — but habitat loss and collection pressure continue  ·  **WARN range:** New Guinea lowland rainforest, Aru and Salawati islands

## Quick facts
| Fact | Value |
| --- | --- |
| Female wingspan | Around 25 cm — second-largest butterfly |
| Defence | Sequesters aristolochic acids from Aristolochia vines |
| Male colour | Black with iridescent green bands and yellow abdomen |
| Larval food | Aristolochia vines |
| Range | Lowland New Guinea, Aru and Salawati islands |
| Main threats | Lowland forest clearance; collection for trade |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Arthropoda
- **Class:** Insecta
- **Order:** Lepidoptera
- **Family:** Papilionidae
- **Genus:** Ornithoptera
- **Species:** Ornithoptera goliath

## Conservation status
- **Status:** Least Concern
- **Population:** No reliable estimate exists
- **Trend:** Decreasing
- **Assessed:** 2020
- **CITES:** Appendix II
- Wider range than Queen Alexandra's birdwing but occupies the same lowland altitude band being cleared for oil palm and logging across New Guinea.

## Key facts: Goliath Birdwing
- The goliath birdwing is the second-largest butterfly in the world, with females reaching a wingspan of around 25 cm.
- Caterpillars feed on Aristolochia vines and sequester toxic aristolochic acids, retaining them into adulthood — the same defensive strategy poison-dart frogs use with dietary alkaloids.
- Both caterpillar and adult are unpalatable to birds because of the stored toxins, which makes warning colouration effective.
- Males are iridescent green and yellow on black; females are larger and predominantly dark brown with cream markings.
- The species occurs across lowland rainforest in New Guinea and on the Aru and Salawati islands.
- Lowland forest clearance and collection pressure affect the species across a range held largely under customary land tenure.

## Toxins from the host plant
Aristolochia vines contain aristolochic acids, compounds that are toxic to most vertebrates. The goliath birdwing caterpillar not only tolerates them but stores them in its body tissues, and the adult retains them after pupation. A bird that eats the caterpillar or butterfly learns quickly not to repeat the mistake.

This is the same principle that makes poison-dart frogs dangerous. Those frogs take alkaloids from ants and mites in their diet and concentrate them in their skin; the goliath birdwing takes aristolochic acids from its larval food plant and carries them through its life cycle. In both cases the animal is advertising unpalatability with bright colour — aposematism — and in both cases removing the food source removes the defence. No Aristolochia, no birdwing.

## Second largest, widely distributed
Queen Alexandra's birdwing holds the size record at around 28 cm wingspan; the goliath birdwing follows at around 25 cm. Unlike its relative, which is confined to a small area of Oro Province, the goliath occurs across much of lowland New Guinea and on several offshore islands.

That wider range earns it a Least Concern listing, but lowland forest is being cleared across the island for oil palm, logging and mining, and the goliath occupies exactly that altitude band. A Least Concern listing describes current range, not the rate at which lowland forest is being removed from it. Collection for the insect trade adds pressure, though the species is on CITES Appendix II rather than Appendix I.

## Sexual dimorphism and display
Male goliath birdwings are vivid — black wings with broad iridescent green bands and a yellow abdomen — while females are larger, darker and less showy. Males patrol forest clearings and stream edges, searching for females, and the iridescent bands shift colour with viewing angle because they are structural rather than pigment-based.

Females lay single eggs on Aristolochia vines, and the caterpillar develops through several instars over weeks before pupating. The pupa is suspended from a stem and the adult emerges after several weeks. The entire life cycle depends on intact lowland forest with sufficient host vines, which is why fragmentation hits this species harder than a range map suggests.

## Customary land and lowland forest
The goliath birdwing's range lies almost entirely within land held under customary tenure in Papua New Guinea and the Indonesian provinces of New Guinea. Protection of lowland forest patches with Aristolochia vines depends on landowning clans choosing to retain them rather than on protected-area designations alone.

Where lowland forest is cleared for oil palm or logging, both the butterfly and its host plant disappear together. CITES Appendix II regulates international trade but does not prevent local forest conversion. The practical conservation front line is the same as for Queen Alexandra's birdwing and for the lowland birds-of-paradise: forest retained on customary land, with host plants and display sites intact.

## What WARN does
WARN publishes free, sourced species education, including the chemical links between unrelated animals. The goliath birdwing and the poison-dart frog defend themselves the same way — by storing toxins from their diet — yet both depend on habitat that lowland forest clearance is removing across New Guinea.

If this guide helps you understand wildlife and the pressures it faces, a gift to WARN supports habitat protection and free public education in our partner countries.

## Frequently asked questions: Goliath Birdwing
### How big is the goliath birdwing?
Females reach a wingspan of around 25 cm, making it the second-largest butterfly in the world after Queen Alexandra's birdwing at around 28 cm.

### Is the goliath birdwing poisonous?
Unpalatable rather than dangerous to people. Caterpillars sequester toxic aristolochic acids from Aristolochia host vines and retain them into adulthood, making both larva and adult distasteful to birds — the same strategy poison-dart frogs use with dietary alkaloids.

### What does the goliath birdwing caterpillar eat?
Vines of the genus Aristolochia. The toxins in the plant are stored in the caterpillar's tissues and carried through to the adult butterfly.

### Where does the goliath birdwing live?
Lowland rainforest across New Guinea and on the Aru and Salawati islands. It occupies the altitude band most affected by oil palm and logging.

### Is the goliath birdwing endangered?
It is listed as Least Concern because of its wider range, but lowland forest clearance and collection pressure continue. The listing describes range rather than trajectory.

### How is it related to Queen Alexandra's birdwing?
Both are in the genus Ornithoptera. Queen Alexandra's is larger and confined to northern Oro Province with Endangered status and CITES Appendix I listing. The goliath is the second-largest and more widespread, on CITES Appendix II.

### Are goliath birdwings dangerous?
What connects this butterfly to poison-dart frogs is chemistry rather than appearance. Give wild goliath birdwings space; do not corner them.

### How long do goliath birdwings live?
A precise wild lifespan for goliath birdwings is not firmly established in the sources cited on this guide. The goliath birdwing (Ornithoptera goliath) is the second-largest butterfly in the world, with females reaching a wingspan of around 25 cm; its caterpillars sequester toxins from Aristolochia vines in the same way poison-dart frogs store alkaloids from their diet. Where longevity figures appear in the literature they vary by region, sex and whether animals are wild or captive.

## Sources
- [IUCN Red List — Ornithoptera goliath](https://www.iucnredlist.org/species/15992/98490865)
- [CITES Appendices](https://cites.org/eng/app/appendices.php)
- [Natural History Museum — birdwing biology](https://www.nhm.ac.uk/)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/goliath-birdwing