# Echidna — Facts, Threats & Conservation

*Tachyglossus aculeatus*

> The short-beaked echidna is an egg-laying mammal native to Australia and New Guinea, recognisable by its sharp spines, elongated snout, and extraordinary ability to sense prey through electric fields — making it one of the most evolutionarily ancient and biologically unique mammals alive today.

**IUCN status:** Least Concern (IUCN)  ·  **WARN range:** Australia, Tasmania, New Guinea

## Quick facts
| Fact | Value |
| --- | --- |
| Type | Monotreme (egg-laying mammal) |
| Body length | 30–45 cm |
| Weight | 2–7 kg |
| Diet | Ants, termites, earthworms |
| Lifespan (wild) | 14–16 years (up to ~45 years) |
| Gestation / incubation | Egg hatches in ~10 days |
| Subspecies | 5 recognised |
| Active period | Predominantly crepuscular/nocturnal |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Mammalia
- **Order:** Monotremata
- **Family:** Tachyglossidae
- **Genus:** Tachyglossus
- **Species:** Tachyglossus aculeatus (Shaw, 1792)

## Conservation status
- **Status:** Least Concern
- **Population:** Possibly 5–50 million in Australia; no precise global figure
- **Trend:** Stable
- **Assessed:** 2016
- **CITES:** Not listed (Appendix II applies to long-beaked echidnas, genus Zaglossus, only)
- Certain subspecies face localised pressure; the Kangaroo Island subspecies (T. a. multiaculeatus) was estimated at 4,000–6,000 individuals when approximately half its habitat burned in the 2019–2020 bushfires.

## Key facts: Echidna
- Echidnas are monotremes — the only mammals besides the platypus that lay eggs rather than giving birth to live young.
- A baby echidna, called a puggle, hatches after just 10 days and is nursed through patches of skin on the mother's belly rather than teats.
- The short-beaked echidna's snout contains approximately 400 electroreceptors that detect the faint bioelectric fields produced by insects and worms.
- Echidnas can enter true hibernation in cold regions, with body temperatures dropping as low as 4.5 °C and heart rates falling to just four beats per minute.
- Despite a wild lifespan of 14–16 years on average, echidnas may live up to 45 years in the wild under exceptional conditions.
- Road traffic, invasive foxes, cats, and dogs, and intensifying bushfires are the primary modern threats to echidna populations.

## What is an echidna?
The short-beaked echidna is a monotreme — a member of the ancient mammalian order Monotremata, which diverged from all other mammals approximately 166 million years ago. It is one of only five living species of monotremes: four echidnas and the platypus. Unlike all other mammals, monotremes retain the ancestral trait of egg-laying, yet they do produce milk and are fully endothermic, giving them a dual identity that has fascinated biologists since European naturalists first encountered them in the late 18th century. The short-beaked echidna's body is stocky and low-slung, measuring 30 to 45 cm in length and weighing 2 to 7 kg depending on region and season. Its entire back and flanks are studded with spines — modified hairs made of keratin — that can reach 50 mm in length. Between the spines lies a coat of coarse brown or black fur. When threatened, the echidna either rolls into a near-perfect ball of spines or drives its body directly downward into the soil with astonishing speed, leaving only a bristling dome exposed. Its elongated snout has no true mouth opening at the tip — instead, a narrow slit at the end of the beak conceals a long, sticky tongue capable of flicking out at extraordinary speed to lap up termites and ants.

## Where do echidnas live?
The short-beaked echidna occupies one of the broadest ranges of any Australian native mammal. It is found across virtually the entire continent of Australia, including Tasmania, as well as the coastal lowlands and montane forests of New Guinea. This exceptional geographic spread is matched by an equally impressive ecological flexibility — the species inhabits alpine heathland, temperate eucalyptus forest, tropical rainforest, semi-arid scrubland, and even suburban parks and gardens. The echidna has no fixed burrow; instead, it shelters opportunistically beneath fallen logs, rock outcrops, thick vegetation, and root systems. In cooler mountainous regions such as the Snowy Mountains and Tasmania, individuals enter true hibernation for weeks to months during winter, selecting hibernacula that help them maintain a body temperature of 8–10 °C. In warmer parts of Australia, echidnas remain active year-round but restrict foraging to cooler hours — dawn, dusk, and night — to avoid dangerous overheating. Their upper lethal body temperature is around 34 °C, and they have limited ability to sweat or pant, relying instead on behavioural strategies such as shade-seeking and water bathing. They are powerful diggers and will rapidly excavate themselves into soil or leaf litter when disturbed. Home ranges vary from as little as 50 ha in productive habitats to over 200 ha in arid regions.

## How does the echidna reproduce?
Echidna reproduction is among the most remarkable in the mammal kingdom. Breeding occurs between July and August in most of Australia, when a female may be followed for days by a train of competing males — sometimes called an 'echidna train'. After mating, the female incubates a single leathery egg directly in a temporary pouch that develops on her abdomen. The egg hatches after approximately 10 days, releasing a puggle — a jellybean-sized, blind, hairless infant weighing just 0.3–0.4 g. The puggle has no teat to latch onto; instead, it laps milk secreted directly through enlarged pores on two milk patches inside the pouch. It remains in the pouch for 45 to 55 days, after which its developing spines make pouch life impractical. The mother then deposits the puggle in a dedicated nursery burrow and returns every five to seven days to suckle it. Weaning occurs at roughly seven months. Echidnas have a slow reproductive rate by mammalian standards — females typically breed only once every one to two years, and young are slow to mature. This low reproductive output means populations can recover slowly from localised losses. The average wild lifespan is estimated at 14 to 16 years, though exceptional individuals may reach 45 years in the wild and 50 years in captivity, making echidnas among the longest-lived mammals relative to their body size.

## How does an echidna find its food?
The echidna feeds almost exclusively on ants, termites, earthworms, and other soft-bodied invertebrates. It locates prey using a combination of its acute sense of smell and an extraordinary electric sense. The short-beaked echidna's snout contains approximately 400 electroreceptors — specialised organs that detect the faint bioelectric fields emitted by muscle contractions and nerve impulses in prey animals. (Long-beaked echidnas of the genus Zaglossus possess up to 2,000 such receptors.) When the beak sweeps across soil, leaf litter, or rotting wood, moisture on the snout's surface conducts these electrical signals to the receptors. This form of passive electroreception, shared with the platypus and very few other vertebrates, allows the echidna to locate invisible prey with high precision — particularly useful in dim conditions or underground. Once prey is located, the echidna attacks with its claws, ripping open termite mounds or logs, and deploys a tongue that can extend up to 18 cm beyond the snout tip and flicks in and out up to 100 times per minute. Because echidnas have no teeth, food is ground between spiny pads on the tongue and a keratinous plate on the palate. A single foraging bout may involve investigating hundreds of sites. An adult echidna may consume thousands of insects per night, making the species an important regulator of ant and termite populations in native ecosystems.

## What threats does the echidna face?
Despite its Least Concern status, the short-beaked echidna faces a range of growing threats across its range. Road mortality is one of the most visible causes of death — echidnas move slowly and may wander roadsides while foraging, making them highly vulnerable to vehicles, particularly at night. Introduced predators brought to Australia after European settlement — including red foxes, feral cats, and free-roaming dogs — prey on juveniles and occasionally on weakened adults. The echidna's primary defensive tactic of curling into a spiny ball is effective against native predators but provides little protection against foxes, which can flip or work around the defence. Habitat degradation is a compounding pressure: land clearing for agriculture, urban development, and logging removes the fallen logs, tree stumps, and loose soil that echidnas depend on for shelter, nesting, and foraging. Climate change amplifies all of these threats — hotter summers push echidnas toward dangerous thermal limits, while the dramatically intensified bushfire seasons of recent years, such as the 2019–2020 Black Summer fires, can cause direct mortality and obliterate food resources and shelter across vast landscapes. The Kangaroo Island subspecies (T. a. multiaculeatus) was estimated at only 4,000–6,000 individuals when roughly half its habitat burned in those fires. Long-term monitoring and university-led citizen science tracking programs are helping researchers map population health at scale.

## What WARN does
WARN does not currently run field projects for the echidna — its range lies outside WARN's in-network countries (Indonesia, Malaysia, Pakistan, Brazil, and Colombia) — and this guide is offered as free educational content. Public awareness of monotreme biology and the pressures echidnas face from invasive predators and habitat loss helps build the broad conservation literacy that supports wildlife protection everywhere.

Every wild habitat protected shelters not just iconic megafauna but ancient oddities like the echidna — animals whose survival keeps 166 million years of evolutionary history alive. Supporting WARN's habitat work helps safeguard the ecosystems that creatures like this depend on.

## Frequently asked questions: Echidna
### Is an echidna a mammal or a reptile?
An echidna is definitively a mammal — it is warm-blooded, produces milk, and has fur. What makes it unusual is that it also lays eggs, a trait shared only with the platypus and no other living mammal. This places echidnas in the order Monotremata, an ancient mammalian lineage that split from the ancestors of all other mammals roughly 166 million years ago.

### What is a puggle?
A puggle is the informal name for a baby echidna. After hatching from its leathery egg inside the mother's pouch, the puggle weighs just 0.3–0.4 g, is about the size of a jellybean, blind, and completely hairless. It nurses by lapping milk secreted through skin pores rather than teats, staying in the pouch for 45 to 55 days before being moved to a nursery burrow while it continues to grow.

### Can an echidna hurt you?
Echidnas are not aggressive and rarely bite. Their primary defence is their spines — a startled echidna will rapidly curl into a spiny ball or dig straight into the ground, making handling painful and difficult. The main risk to humans is inadvertently injuring an echidna by trying to pick it up or by driving near one on a road at night.

### How long do echidnas live?
In the wild, echidnas typically live 14 to 16 years, though anecdotal records suggest some individuals may reach 45 years. In captivity, the longest confirmed lifespan is approximately 50 years, making them exceptionally long-lived for an animal of their body size. Their slow metabolism and low heart rate during torpor may contribute to this longevity.

### Do echidnas hibernate?
In cooler parts of their range — particularly Tasmania and alpine regions of south-eastern Australia — echidnas enter true hibernation during winter. Body temperature can fall as low as 4.5 °C and heart rate drops to as few as four beats per minute. In warmer regions, they do not hibernate but may enter shorter periods of torpor or simply adjust their activity to cooler parts of the day.

### Are echidnas endangered?
The short-beaked echidna is classified as Least Concern by the IUCN, and its overall population trend is considered stable, with estimates of possibly 5–50 million individuals in Australia. However, certain subspecies face localised pressures, and threats from invasive predators, road mortality, and intensifying bushfires are real and growing. The three species of long-beaked echidnas found in New Guinea are far more threatened, with most listed as Critically Endangered.

## Sources
- [IUCN Red List — Tachyglossus aculeatus](https://www.iucnredlist.org/species/41312/21964662)
- [Animal Diversity Web — Tachyglossus aculeatus](https://animaldiversity.org/accounts/Tachyglossus_aculeatus/)
- [Short-beaked Echidna Fact Sheet — IELC LibGuides](https://ielc.libguides.com/sdzg/factsheets/short-beaked-echidna)
- [Electroreception in monotremes — Journal of Experimental Biology](https://journals.biologists.com/jeb/article/202/10/1447/8186/Electroreception-in-monotremes)
- [Cooling rates and body temperature regulation of hibernating echidnas — Journal of Experimental Biology](https://journals.biologists.com/jeb/article/210/4/586/17232/Cooling-rates-and-body-temperature-regulation-of)
- [Short-beaked Echidna — Britannica](https://www.britannica.com/animal/echidna-monotreme)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/echidna