Categories: anxiety

Kittens Sometimes Suck Their Thumbs

Kittens sometimes suck their thumbs and before today I never had any idea that this happened. It looks strangely human. It’s interesting because it tells us about cat emotions. Thumb sucking is an extension of sucking at mother’s nipple. It is an intuitive behavior which can start in the womb.

Video screenshot

For a weaned child thumb sucking is a source of pleasure and comfort i.e a ‘pacifier’. It is the emotional comfort element that interests me because if kittens sometimes suck their thumbs they are doing it for the same reason as humans. In which case the kitten feels the emotional comfort of thumb sucking. Perhaps we no longer need evidence that cats have quite complex emotions but this behavior confirms that cats feel anxiety and seek emotional comfort.

I’ll have to assume that kittens thumb suck for the same reason as humans. As they develop and are weaned off nutritional sucking they find alternative ways to find comfort and soothing experiences. For adult cats this might mean being in close contact with their human caretaker or with a cat or dog friend.

Early Weaning

Sometimes when a cat is prematurely weaned they can develop behavior problems. A well-known issue is pica; eating non-food, non-nutritional objects. Pica affects cats and kids. There are adult cats who, for example, suck on the ear lobe of their owner. You’ll see Siamese cats wool-sucking. It is another variant of the same problem. It is thought that fabric chewing in cats is a variant of thumb sucking.

Fabric chewing in cats may be like thumb sucking in infants

But I had never before realized that kittens sometimes suck their thumbs. For me it is a reminder that there are many areas of overlap between the cat and the human in terms of anatomy, behavior and psychologically.


Wikipedia states that thumb sucking is a form of behavior found in humans, chimpanzees and captive ring-tailed lemurs. They will have to amend their page and add cats.

Please comment here using either Facebook or WordPress (when available).
Michael Broad

Hi, I'm a 71-year-old retired solicitor (attorney in the US). Before qualifying I worked in many jobs including professional photography. I have a girlfriend, Michelle. I love nature, cats and all animals. I am concerned about their welfare.

View Comments

  • Good piece and excellent explanation of the physical/emotional comfort link.

    I think people will eventually accept that other species are emotional, if only humans would understand that emotions drive us all to live. Without them we would not eat or drink!

Recent Posts

Japanese shopowner replaces ceiling tiles with transparent ones for their cats

This is a cool solution for a cat guardian and shopowner who wants to allow…

4 hours ago

600 rescue cats and dogs in a Hercules C-130 plane in historic flight

The charities involved have shipped 600 rescue cats and dogs from Hawaiian animal shelters in…

5 hours ago

Spot the witches hat in this bank of feline faces at night

A Halloween puzzle to kill a few minutes. This is what a witches hat looks…

6 hours ago

Domestic cat’s highly-acidic digestive system

The domestic cat's digestive organs quite closely resemble those of humans. Working backwards they are…

18 hours ago

It’s National Cat Day in the US so what can I do about it?

National Cat Day was started to highlight cats at cat rescue shelters and to celebrate…

22 hours ago

Chicago cat shelter sells groups of feral cats for up to $600 to combat city’s rat problem

The CNN video tells us that Chicago has the worst rat problem in America. A…

1 day ago