The rapid-fire clicking your cat makes at the window

Priya first noticed the sound on a Saturday morning. The cat was at the sliding door, staring at the finches on the feeder.

Then a fast, dry clicking. Almost mechanical, coming from the cat's mouth.

Priya thought something was wrong with the cat's teeth, so she looked closer. The jaw was moving so quickly it blurred.

The finches flew off. The clicking stopped instantly.

Since then, every bird at the feeder triggers the same performance. No bird, no chatter.

The common guess is frustration, a cat venting because the glass keeps her from the hunt. Some assume it is a threat display, or an involuntary tic.

She is rehearsing the kill.

Cats dispatch prey with a precise bite to the base of the skull, called the nape bite. The bite severs the spinal cord at the cervical vertebrae, and it depends on a very specific, rapid jaw motion to close before the prey can twist away.

That jaw motion is what you are hearing.

The chatter is the killing bite firing without a target. Behaviorists call it a fixed action pattern, a hardwired sequence that runs to completion once the trigger is strong enough, even if the outcome is impossible.

Sight of prey through the window is a powerful trigger. Scent and sound are missing, so the sequence does not fully commit, but the terminal motor pattern leaks out anyway.

There is a second theory, drawn from field observations of wild cats. Researchers have documented margay cats in the Amazon mimicking the calls of small primates to lure them closer.

The chatter may be a vestige of prey mimicry, an attempt to sound like something the bird wants to investigate.

Both theories can be true at once. The behavior is likely a compressed hunting sequence, rehearsal and lure and frustration folded into one burst.

The instant intensity is the tell. Frustration builds and lingers, but a killing bite fires and resolves.

✓ Let her chatter. This is normal predatory expression, and interrupting it disrupts a healthy outlet for hunting drive.

✓ Give her real prey substitutes. Wand toys that move like birds, feather-tipped teasers, and small mouse-shaped toys let her run the full sequence, stalk to pounce to bite, and reach completion.

✓ End play sessions with a "kill." Let her actually catch and grip the toy at the end, then follow with a small meal to mirror the wild hunt-eat cycle.

✓ If she chatters at things that are not there, or the behavior is paired with rippling skin along the back and sudden bolts of running, that is feline hyperesthesia and warrants a vet check.

Next case on the desk: a dog who steals items and drops them at the owner's feet. Delivery, then departure.