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Why Do Squirrels Chase Each Other? Three Reasons, by Season

Spiralling chases up a tree are courtship, territory or play, and the time of year tells you which. How to read one, and when it turns serious.

By Zakaria 4 min read Save to Pinterest — opens Pinterest in a new tab
A grey squirrel sitting up on a weathered fence rail, forepaws together
Photo: Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons
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Three reasons — courtship, territory, or play — and the month tells you which. The same spiralling run up a trunk means something different in January than it does in October.

Reading a chase

Three kinds of chase, and how to tell them apart
Mating chaseTerritorial chasePlay
WhenDec–Feb and Jun–AugYear-round, peaks in autumnSpring and summer
How manySeveral males, one femaleUsually twoTwo or more, usually juveniles
How longCan run for an hourShort, seconds to a minuteIntermittent, on and off
NoiseFairly quiet; some soft callsLoud — barking, chatteringQuiet
TailsFlagging, wavedStiff, flicking hardLoose, relaxed
ContactLittleLunging, sometimes bitingWrestling, no injuries
Role reversalNo — one is pursuedNoYes, constantly

Role reversal is the most reliable single tell. If the animal being chased turns and becomes the chaser, and they swap again a minute later, you are watching play.

The mating chase

This is the one people film and ask about.

  • Several males follow one female, sometimes five or six, in a line
  • They are drawn by scent — a female is receptive for less than a day, and males detect it from a considerable distance
  • The chase runs up trunks, along branches, across fences and roofs, and can continue for an hour
  • The dominant male usually stays closest, but the female’s choice and sheer persistence both matter
  • It ends with mating, or with the female escaping, and then the whole group disperses

Two seasons, not one. Grey squirrels typically breed in late winter and again in midsummer, which is why the same spectacle appears twice a year.

Why they spiral around the trunk

A squirrel escaping anything keeps the trunk between itself and the pursuer, and spiralling forces the follower to commit to one side of the tree. It is the same manoeuvre they use against hawks and cats.

So the spiral is not a courtship display — it is an escape reflex showing up in a chase that is not really an escape. Which is part of why mating chases go on so long: the female is using genuine evasion.

The territorial chase

Shorter, sharper and much noisier.

  • Peaks in autumn, when nuts and acorns are being cached and a good patch is worth defending
  • Concentrated around food: a feeder, a nut tree, a cache site
  • Loud barking and chattering, tail flicking hard with each call
  • The loser leaves quickly; squirrels are not built for sustained fighting

Feeders make this worse. A single feeder is a rich, fixed, defensible resource, so one dominant animal will burn real energy holding it against all comers. Spread the food out, or baffle the feeder properly, and the arguments largely stop.

Play

Mostly that year’s juveniles, and it looks exactly like what it is: practice.

  • Tumbling, wrestling, looping around branches
  • Constant role reversal
  • No injuries, no raised hair, no serious noise
  • Tails loose and relaxed rather than rigid

It is how young squirrels develop the reflexes they will need against hawks — and against each other come autumn.

When it is a real fight

Do not intervene

Real fights are uncommon and brief, because squirrels can genuinely injure each other and both animals know it. Signs are screeching, hair raised along the back and tail, lunging that connects, and sometimes visible wounds on the ears, flanks or tail.

Stay out of it. A cornered or handled squirrel bites hard, and in some regions squirrels are treated as a rabies-vector species even though transmission is very rare. If an animal is visibly injured, call a licensed wildlife rehabilitator rather than approaching it.

What it means for your yard

  • Chases are normal and almost always harmless, however alarming they look.
  • Constant chasing around a feeder is a resource problem, not a behaviour problem. Spread the food, or squirrel-proof the feeder with a baffled metal pole and 8 to 10 feet of clearance around it.
  • A sudden increase in chasing in late winter means breeding season, and it means kits in a drey in about six weeks. That is worth knowing before you block a roof gap or cut a tree.
  • Autumn chasing goes with caching, which is also when squirrels dig up lawns and containers. They relocate a large share of what they bury within hours of burying it, often because a rival watched them do it.

Common questions

Why do squirrels chase each other?

Three reasons, and the season usually tells you which. Mating chases run in late winter and again in midsummer, with several males pursuing one female in long spiralling runs up and around tree trunks. Territorial chases happen year-round but peak in autumn when food is being cached, and are shorter, more direct and often noisy. Play-fighting is mostly juveniles practising, looping and tumbling with no real aggression. A mating chase is the one people notice most, because it involves several animals and can go on for an hour.

Are squirrels playing or fighting when they chase?

Look at the tails, the noise and the contact. Play and courtship are near-silent with loose relaxed tails, no injuries and frequent role reversal, where the chased becomes the chaser. A real fight is loud — barking, chattering and screeching — with a stiff flicking tail, hair raised, and lunging that makes actual contact. Genuine fights are brief, because squirrels have the bite to hurt each other badly and the loser leaves.

What time of year do squirrels chase each other most?

Two mating peaks — roughly December to February and again June to August for grey squirrels — plus a territorial peak in autumn when acorns and nuts are being cached. Spring and early summer add juvenile play as that year's young start exploring. Which is why the answer to the question depends on the month you are watching, and why the same behaviour reads completely differently in January and October.

Why do squirrels spiral around a tree trunk when chasing?

Because it is the most effective way to break pursuit. A squirrel keeps the trunk between itself and whatever is behind it, and a spiral forces the follower to commit to one side. They use exactly the same trick to escape hawks and cats, so it is not a courtship display as such — it is an escape manoeuvre being used in a chase that is not really an escape.

Should I be worried about squirrels fighting in my yard?

Almost never. Chases look violent and are overwhelmingly harmless, and squirrels sort out rank without serious injury most of the time. Intervening is a bad idea — a cornered squirrel bites hard, and it is a rabies-vector species in some regions even though transmission is very rare. The one thing worth acting on is a concentrated food source, because a single feeder can turn ordinary territorial behaviour into constant conflict.

Do squirrels chase each other away from bird feeders?

Constantly, and that is territorial rather than social. A feeder is a rich, fixed, defensible food source, so a dominant squirrel will spend a surprising amount of energy driving others off it. Spreading food across several points, or squirrel-proofing the feeder properly with a baffled pole, reduces the conflict — one feeder in one place concentrates every squirrel in the neighbourhood into one argument.

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