Tag Archives: Evolution

Did you know that domestic cats… ?

This time I will give some information about the behavior of domestic cats that I think is interesting and less widely known. I’ll describe the results of various scientific studies, which mostly describe general trends. Of course, your individual cat could act differently or have different preferences, due to e.g., personality, experience or breed. If that’s the case, feel free to let me know.

… are the only* cat species that uses the “tail up” signal?

A vertically raised tail is a housecat’s sign of friendly intentions. When two cats meet, often the one who is lower in the hierarchy (or feels in a weaker position) raises its tail first.

Cats also use this signal of affiliation towards people.

The wild cats from which the domestic cat is derived do not use the “tail up” signal. One theory is that it evolved in ancient Egypt, where cats were bred in large groups (an unnatural situation for wild cats), and a clear signal of friendly intentions let them avoid unnecessary conflicts.

… prefer different toys depending on whether they are hungry?

When cats are hungry, they are more likely to attack larger prey. A similar effect can be seen in the context of play – cats usually prefer mouse-sized toys, but when hungry they choose rat-like toys. In wild animals, hunger tends to lower the desire to play altogether.

This suggests that playing and hunting are very similar for domestic cats.

… are less aggressive when given the opportunity to play?

Too little play and a non-stimulating environment can contribute to aggression in cats (and dogs).

Even adult cats need to play, although they usually only want to do so for 2-3 minutes at a time. If you would like to play with your cat longer, wait for him/her to initiate the interaction. Research suggests that when the cat, rather than a human, initiates play, the interaction usually lasts longer. Other research shows that cats prefer a man-operated “fishing rod” to unanimated toys, and of course new toys are more interesting than old ones**.

Additionally, playing with a “fishing” toy reduces cats’ tendency to hunt wild animals.

… can use catnip as mosquito repellant?

Many cats (including wild cats, such as lynx, leopard and lion) react vigorously to catnip. They rub their head against the plant and roll in it. The smell of catnip activates the reward system in cats and the secretion of endorphins, similarly to opium’s effect in humans. However, catnip is not addictive to cats and is often added to toys by manufacturers.

It seems that the reaction to catnip is not only about euphoria. Catnip contains substances that repel mosquitoes and other insects. When rubbing against the plants these substances are transferred to the cat’s fur and it becomes less attractive to mosquitoes and other insects.

Cats hunt from ambush, by slowly sneaking up to their prey and waiting for the right moment to attack. While doing that they are an easy target for mosquitoes, which is why catnip-based repellant is a great solution (by the way, substances in catnip also repel mosquitoes when applied to human skin).

 * One exception is that lions – the only wild cats that live in groups – also raise their tails in some affiliative interactions with others. Nevertheless, I never saw lion’s tail raised as highly as domestic cat’s tail. This behavior has certainly evolved independently in domestic cats.

** Small suggestion from me: to prevent kids from getting bored with all their toys, it’s a good idea to hide some of them away. After some days/weeks/months you hide different toys and return the old ones, that now become attractive. I would expect that it works for cats as well.

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Photo: EVG Culture from Pexels.com

Did you know that wild mice that live near people are better at solving problems?

House mouse

Human activity is transforming the environment so much that many animal species are losing their place to live. But there are also a minority of species that can adapt to the new reality to some extent, or even prosper in it. Although life in the city means noise, pollution and less vegetation, there are also positive sides: an additional source of food all year round (in the form of leftovers from our tables) and fewer natural enemies (although cats are a big threat for many birds).

Living around people has an impact on animal behavior – for example, many birds in cities sing at higher frequencies to distinguish themselves from traffic. Research on birds also indicates that those living in urban areas are better problem solvers.

Coping with new problems seems to be one of the most important cognitive skills needed in the rapidly changing and unnatural environment created by humans. Recently, scientists have shown that mice that live close to humans are better problem solvers and, in at least one species, this is an innate ability that is a result of evolution, instead of something they learned during life.

Urban versus rural mice

In the first experiment, scientists caught striped field mice in the city and in rural areas. After treating all mice the same for a year in the laboratory, the tests began.

The mice were given various problem-solving set-ups (including a LEGO house – I’m not the only one who comes up with such ideas) which when opened – by pulling, pushing or moving various elements – gave them access to food.

Mice that were caught in the city were more likely to solve these problems. This couldn’t be explained by a fear of strange objects in the rural mice, because they actually approached the set-ups sooner and interacted with them longer.

As I wrote above, this experiment was carried out on mice that were born and grew up in the wild and it is possible that they could develop their cognitive abilities then – differently in rural and urban areas.

Long-term coexistence with humans

To find out the importance of long-term coexistence with humans, the same scientists conducted research on another species of mice – the house mouse. It is a synanthropic species that occurs almost exclusively near humans (this species also includes laboratory mice and various breeds of domestic pets).

There are several subspecies of domestic mice that have been associated with humans for different lengths of time: the Western European house mouse (Mus musculus domesticus) – about 11-13 thousand years, the Eastern European house mouse (Mus musculus musculus) – about 8,000 years, and the southeastern Asian house mouse (Mus musculus castaneus) – between 7,600 and 3,800 years. Thus, each of these subspecies had more or less time to adapt, through evolution, to humans’ changes to the environment (even if the living environment of people also changed a lot over these thousands of years). To eliminate the influence of individual mice’s life experience on the research, scientists did not study wild mice caught in the field, but studied their descendants, after several generations in the laboratory under constant conditions.

Adapting to life with humans

The descendants of the wild house mice were subjected to the same problem-solving tests as the field mice in the previous experiment. It turned out that the longer a mouse subspecies was associated with humans, the more likely it was to solve the problems. And this couldn’t be explained by the differences between subspecies in the time they took to approach the set-ups, or the differences in fear of a new environment.

Since all these experimental animals had lived under the same conditions throughout their lives, these studies show that different subspecies differ in their innate ability to deal with new problems. It seems that over the course of generations, coexistence with humans influenced the evolution of cognitive skills in wild animals.

Photo based on 4028mdk09, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=11056096

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