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Do Squirrels Fight Each Other? Mostly Chasing, Rarely Injury

Squirrels chase, box and scream at each other constantly, but genuine injury is rare. What looks like a vicious fight is usually territory or mating.

By Zakaria 3 min read Save to Pinterest — opens Pinterest in a new tab
Two squirrels chasing
Photo: tpa, Pixabay Content License, via Pixabay
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Yes — and if you watch a garden for an hour in February you will see several. But almost none of it is a real fight. The chasing, boxing and screaming is a system for settling disputes without fighting, which is why it happens so often and injures so rarely.

Reading the behaviour

The escalation is a ladder, and most encounters stop a long way up it:

The sequence, in order
StageWhat you seeHow often it goes further
Tail flickingSharp tail jerks, body tenseUsually ends here
Chatter or screamLoud rasping callOften ends here
Stiff-legged approachSlow, high stanceSometimes
BoxingBoth rear up, front paws slappingSometimes
GrapplingTumbling, bitingUncommon
Sustained fightRepeated bites, bloodRare

The point of the ladder is that every rung is cheaper than the one above it. A squirrel that can see off a rival by screaming at it has won without risking a broken tooth or an infected bite — and an injured squirrel in a tree is a dead squirrel soon enough.

The two kinds of chase, and how to tell them apart

Mating chase. In late winter (roughly January–February) and again in midsummer, a female in oestrus is pursued by a train of males, sometimes four or five, for hours. It covers whole trees and roofs, it is noisy, and it looks like a mob attack.

It is not. It is competition among the males and a test by the female, and she controls it. Nobody is usually hurt. If you are seeing a sustained multi-squirrel chase in February, this is what it is.

Territorial chase. At any other time, a chase is typically one resident moving one intruder off a food source or a cache area. It is shorter, more direct, and ends as soon as the intruder clears the boundary.

Your feeder may be causing it

A single feeder or one spot where food is put down concentrates every squirrel in the area onto one defensible point, which is exactly the condition that produces conflict.

Scatter food in several places instead, several metres apart. Disputes drop sharply, because there is no longer one prize worth defending.

When it is genuinely serious

Two situations where squirrel aggression does kill, both worth knowing because they explain behaviour that otherwise looks inexplicable:

Infanticide by males. Male squirrels sometimes kill unrelated young in a nest. It is well documented across several squirrel species, and the logic is grim but straightforward: it removes a rival’s offspring, and it can return the female to breeding condition sooner.

Nest cavity and winter food disputes. A good tree cavity is a scarce resource, and a cornered fight over one — or over food in a hard winter — can escalate past the usual off-ramps.

Among healthy adults in an ordinary season, neither is what you are watching.

What not to do

Do not break it up. The animals are highly aroused, squirrel bites carry real infection risk, and the encounter will be over in a minute or two regardless.

Do not assume an injured-looking squirrel needs rescuing. Missing tail fur, a torn ear and a scarred nose are standard wear on an adult male and do not impair him. Tail fur is also shed deliberately when something grabs it — the same trick a lizard plays with its tail.

Do call a licensed wildlife rehabilitator for a squirrel that is bleeding heavily, cannot climb or flee, or is a lone young animal on the ground. That is a job for someone with the permit and the equipment, not for a towel and a cardboard box.

Common questions

Do squirrels fight each other?

Constantly, but almost all of it is ritual rather than combat. Squirrels chase, box with their front paws, flick their tails, chatter and scream at each other, and the overwhelming majority of these encounters end with one animal simply leaving. Genuine fights causing injury do happen — torn ears, scarred noses and missing tail fur are common on adult males — but serious wounds are uncommon and deaths from fighting are rare. The display is doing the work the fight would otherwise have to.

Why are squirrels chasing each other around a tree?

Either mating or territory, and the time of year tells you which. In late winter and midsummer, the breeding seasons, a female in oestrus is followed by several males in a prolonged chase that can last hours and is a form of competition rather than aggression — she is testing them. Outside those periods, a chase is usually a resident animal moving an intruder off a food source or a cache area, and it ends quickly once the intruder leaves.

Do squirrels kill each other?

Rarely between adults, but it does occur in two situations. Males occasionally kill unrelated young, which removes a competitor's offspring and can bring the female back into breeding condition — this is well documented in several squirrel species. And a cornered fight over a nest cavity or in a food-scarce winter can turn fatal. Among healthy adults in a normal season, however, nearly all conflict is resolved by display and pursuit without contact.

What does squirrel fighting look like?

A sequence that escalates and usually stops partway. It begins with tail flicking and a chattering or rasping call, moves to a stiff-legged approach, then to boxing with the front paws while both animals rear up, and only then to grappling and biting. At any point either animal can break off and run, and most do. Wrestling pairs that tumble together down a tree trunk look alarming and typically separate unharmed.

Why do squirrels scream at each other?

The loud rasping scream or chatter is a territorial and alarm call, and squirrels direct it at each other as a warning before a chase begins. It carries well, which is the point: a resident can see off a rival without the cost of a physical fight. The same vocal range is also used for predators, and the sound aimed at a cat or a hawk is often indistinguishable to a human ear from the one aimed at another squirrel.

Should you break up a squirrel fight?

No. Intervening risks a bite from an animal that is already highly aroused, squirrel bites carry real infection risk, and the fight will almost certainly resolve itself within a minute or two. The exception is a squirrel that is visibly injured and unable to flee, which is a case for a licensed wildlife rehabilitator rather than for direct handling. Feeding stations are worth checking too, since a single concentrated food source causes far more conflict than scattered food.

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