Why Do Possums Play Dead? And How Long It Lasts

Playing possum is an involuntary shock state, not a decision. Why it happens, how long it lasts, and what to do with one lying in your yard.

By Zakaria September 16, 2026 4 min read Save to Pinterest

A Virginia opossum on top of a wooden fence at night, caught in a camera flash — Photo: Sergey Yarmolyuk, CC BY-SA 4.0, via Wikimedia Commons

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Playing possum is not a decision. It is an involuntary shock state — closer to fainting than to acting — triggered when an opossum is frightened past the point its other defences work.

The short answer

An opossum plays dead because most predators that hunt by chasing lose interest in prey that stops moving, and many avoid carrion. But it is not voluntary: extreme threat triggers an involuntary shock state called thanatosis, in which the animal collapses, stiffens, drools, drops its heart rate and breathing, and releases a foul green fluid from its anal glands so it smells dead as well as looking it. Episodes last from a few minutes to about four hours, and the possum cannot end one at will — it recovers gradually as its nervous system settles, which is why leaving it completely alone is the right response.

Involuntary — a shock response, not a performance
Works because predators ignore prey that stops moving
Includes a foul anal-gland secretion — it smells dead too
Lasts minutes to about four hours
Leave it alone. Standing over it prolongs the episode

What actually happens

Threatened, an opossum first tries everything else: it hisses, bares an impressive fifty teeth, growls and tries to leave. Those are bluffs — the animal is not a fighter.

When the threat continues, the nervous system takes the decision away from it. The possum:

Collapses onto its side, body curled and stiff
Lips drawn back, tongue out, eyes open or half-closed
Drools heavily
Heart rate and breathing drop sharply
Releases a green, foul-smelling fluid from the anal glands

That last part is the detail that makes it work. A predator is not only seeing a dead animal, it is smelling a rotting one — and most predators that kill for themselves will not eat carrion they did not make.

Why the trick works

Against what it does and does not work

Threat	Effective?	Why
Fox, coyote, bobcat	Yes	Hunt by chasing movement; avoid carrion
Large birds of prey	Often	Movement-triggered strike
Dog	Poorly	A dog will keep worrying a motionless animal
Car	Not at all	The response is triggered by headlights and noise at the worst moment
Human	Unnecessary, but triggered anyway	It cannot tell the difference

This is the tragedy of the behaviour. It evolved against predators that respond to movement, and it is close to useless against the two things that kill most opossums today. A possum frozen in a road is not being stupid — its nervous system has committed it to a strategy that stopped working a century ago.

How long it lasts

A few minutes to about four hours, with most episodes far shorter than the upper figure.

The animal does not choose the moment to get up. Recovery is gradual — typically it starts with the ears twitching as the possum begins sampling its surroundings, then the head lifts, then it leaves quickly.

Which means your job is to go away

The state persists as long as the animal perceives threat. Standing over it, poking it, photographing it from a foot away or letting a dog sniff it all extend the episode and deepen the stress. Bring pets in, go inside, and check from a window.

Dead, or playing?

Do not test it by touching. Look for:

Probably thanatosis: lips drawn back, tongue lolling, drool, stiff curled body, strong foul smell, no visible injury, found near cover or after a dog or a car encounter.

Probably dead: visible injury or blood, flies already present, body limp rather than stiff and cool to the surroundings, or still in exactly the same position many hours later.

The reliable test is time. Leave the area completely and check again in one to two hours.

What to do

Leave it alone. No poking, no moving, no box.
Bring pets and children indoors and keep them in.
Give it space for a couple of hours, checking from a distance.
Call a licensed wildlife rehabilitator — not animal control, if you can avoid it — if it is visibly injured, if it is still there after several hours, or if it is a female, since her pouch may hold young that will not survive her.
Never handle one bare-handed. Not because they are dangerous, but because handling terrifies them and it is unnecessary.

Opossums are worth having around

They eat slugs, snails, cockroaches, beetles, rodents, carrion and fallen fruit, they are among the least aggressive backyard mammals, and they very rarely carry rabies — their body temperature is low enough to make the virus difficult to sustain. Secure the trash, the pet food and the chicken run, and there is very little reason to want one gone.

A note on the word

The animal in North American backyards is the Virginia opossum, the only marsupial native to the US and Canada. “Possum” without the O is, strictly, a different group of animals in Australia and New Guinea — which do not play dead. In everyday American use the two words are interchangeable, and “playing possum” has been in the language since the early 1800s.

Common questions

Why do possums play dead?

Because most predators that hunt by chasing lose interest in prey that stops moving, and many avoid carrion outright. But the possum is not choosing to do it — extreme threat triggers an involuntary shock state called thanatosis, closer to fainting than to acting. The animal collapses, goes stiff, drools, its breathing and heart rate drop, and it releases a foul green fluid from its anal glands that makes it smell convincingly dead.

How long do possums play dead?

Anywhere from a few minutes to around four hours, with most episodes lasting well under an hour. The possum cannot end it at will — it comes out of the state gradually as its nervous system recovers, usually starting with a twitching ear as it checks whether the threat has gone. This is why moving away and leaving it alone matters: standing over it prolongs the episode.

Is the possum in my yard dead or playing dead?

Look for the tell-tales rather than touching it: a possum in thanatosis often has its lips drawn back, tongue out, eyes open or half-open, drool around the mouth, and a strong foul smell from the anal glands. Its body is stiff and curled. The reliable test is time — leave the area entirely, watch from a window, and check again in an hour or two. A live one will have gone.

Can a possum control playing dead?

No. It is an involuntary physiological response triggered by extreme fear, not a trick the animal performs. That is also why it is a poor defence against cars and dogs, which do not respond to it the way a fox or bobcat does — a dog will keep worrying a motionless possum, and the possum cannot get up and run even though doing so would save it.

What should I do if I find a possum playing dead?

Leave it completely alone, bring pets and children indoors, and give it space for a couple of hours. Do not poke it, move it, or try to wake it, and do not put it in a box — handling extends the episode and stresses the animal badly. If it is still in exactly the same place after several hours, or if it is visibly injured, bleeding or a female whose pouch may hold young, call a licensed wildlife rehabilitator rather than handling it yourself.

Are possums dangerous or worth having around?

They are among the least aggressive backyard mammals — hissing and playing dead are both avoidance behaviours, not attacks — and they very rarely carry rabies, as their body temperature is low enough to make it difficult for the virus. They eat slugs, snails, cockroaches, beetles, rodents, carrion and fallen fruit, which makes them useful cleanup animals. The most sensible policy is to secure your trash, pet food and chicken run and otherwise leave them be.

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An opossum gripping the top edge of a wooden fence at night

Backyard Animals · Sep 6, 2026