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Why Do Squirrels Chirp? It Is Usually About You

Why do squirrels chirp: most calls are alarm, and the pattern tells you what kind of threat. How to read the 4 main sounds and what each one is reacting to.

By Zakaria 3 min read Save to Pinterest — opens Pinterest in a new tab
A grey squirrel on a mossy branch with its tail raised, mouth open mid-call
Photo: debannja, Pixabay Content License, via Pixabay
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A squirrel chirping repeatedly from a branch is almost always alarm calling, and nine times out of ten in a garden the thing it is alarmed about is the person standing underneath it.

The four sounds, and what each means

Reading a squirrel by ear
SoundWhat it looks likeUsually means
Repeated short barksTail flicking, body tense, facing youGround threat — cat, dog, person
Longer drawn-out callFlattened against a branch, stillAerial threat — hawk, drone, large bird
Tooth chatterClose to another squirrelTerritorial warning, food dispute
Thin high squeakSmall animal, often on the groundNestling separated from its mother

Why announcing yourself works

It seems counterproductive for a prey animal to make noise at a predator. It is not, and the reason is the same across many species that do it.

Ambush predators need surprise. A cat that has been seen, and knows it has been seen, has lost the stalk. The call is addressed as much to the predator as to other squirrels: I can see you, this is not going to work, go somewhere else.

That is also why the calling stops when you leave rather than when you stand still. The squirrel is tracking the threat, not reacting to a sound.

The two-threat distinction

Work on grey squirrels and on several ground squirrel species has found that the calls differ by threat type, and — more tellingly — that other squirrels respond differently depending on which call they hear.

  • Terrestrial threat: faster, repeated barking. Other squirrels tend to climb and watch.
  • Aerial threat: longer, more drawn-out calls or a screech. Other squirrels tend to freeze flat against a trunk or dive for cover.

The second response is the correct one for a hawk and the wrong one for a cat, which is the evidence that the distinction carries information rather than just being louder or quieter alarm.

Note

Chipmunks do something comparable, which is why a garden with both can sound like an argument. The chipmunk’s call is higher and more metallic, often a single repeated “chip” at long intervals, and it can continue for a very long time from cover.

What to do about it

Nothing, mostly. It is not aggression and the squirrel is not going to do anything beyond calling.

If it bothers you:

  • Move away. The call tracks the threat and ends when the threat leaves.
  • Check for a cat. Sustained calling from one tree with nobody around is usually a cat sitting underneath, or a hawk perched nearby.
  • Look for a nest if it happens every time you use one part of the garden in spring or late summer. A female with young in a drey calls more readily and at longer range, and the behaviour stops when the young disperse.

Common questions

What does it mean when a squirrel chirps at you?

It is an alarm call, and you are the alarm. A squirrel that has spotted you and feels exposed will call repeatedly while flicking its tail, which both warns other squirrels and signals to the threat that it has been seen. Predators rely on surprise, so announcing detection is a real deterrent — the squirrel is telling you that stalking it is now pointless.

Why do squirrels make a chattering teeth sound?

Tooth chattering is distinct from vocal calls and generally signals agitation or a territorial warning at close range, often directed at another squirrel rather than at you. It frequently accompanies a standoff over food or a nest site. In some contexts it also appears as a stress behaviour when an animal is cornered.

Do squirrels have different calls for different predators?

Research on grey squirrels and several ground squirrel species has found that call structure varies with the kind of threat — broadly, faster repeated barks for a terrestrial predator and longer, more drawn-out calls or screeches for an aerial one. Other squirrels respond differently depending on which they hear, which is the evidence the distinction is real rather than incidental.

Why does a squirrel chirp for so long?

Because the threat has not left. Alarm calling continues while the animal can still see what triggered it, and bouts of several minutes are routine when a cat sits under the tree or a person stands still nearby. Walking away usually ends it within a minute, which is the simplest confirmation of what the call was about.

Do baby squirrels make noise?

Yes — nestlings make high, thin squeaks that carry surprisingly far, and a repeated distress cry from a young squirrel on the ground usually means it is separated from its mother. In most cases the mother will retrieve it if people and pets keep clear for a few hours.

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