Cats love catnip, just look at the shelves of any pet store full of toys with catnip. They sniff it, bite it, roll on the floor and even drool, as if they were entering a kind of trance. We believed that this herb was our kitties’ favorite “drug”, but researchers have discovered that there is another plant that attracts them even more.
The experiment. A group of Japanese researchers set out to discover which plant attracts cats the most, catnip or matatabi (also known as silvervine). To do this, they combined three trials: free cats in a garden with fresh plants, free cats with a brick impregnated with the extract of both plants and cats in captivity with impregnated papers. The researchers recorded on video the episodes of self-anointing, which is when they rub each other and make “croquettes” near the different plants.
The matatabi wins by a landslide. All groups of cats that participated in the experiment showed a clear preference for matatabi. In the case of free-ranging cats that had access to both the plants and the impregnated brick, almost all self-anointing episodes occurred with the matatabi. Among the captive cats, 15 responded only to the matatabi, three to both, and three sniffed a little but did not rub against them.
The curious thing is that the chemical analysis revealed that catnip was much more powerful (it contains much more nepetalactone) than matatabi, but despite this the cats had a very clear preference. Masao Miyazaki, project leader, states in Phys that One might expect that a plant containing more active compounds, and compounds that clearly work in laboratory tests, would trigger a stronger behavioral response under free-choice conditions. But that’s not what we observed.”
The Overwhelmed Smell Theory. The authors’ hypothesis is that catnip, especially when fresh, releases an excessive amount of these compounds and makes the smell too intense, hence cats prefer matatabi because it is milder. This fits with an anecdote in ‘The Gardeners’ Dictionary’ published in 1789, which observed that cats preferred catnip when it was wilted rather than fresh, which reinforces the idea that it can saturate their senses.
A biological reason. Rubbing against these plants is not simply to get high, it also hides an evolutionary purpose: it acts as a defense mechanism against mosquitoes and other parasites. When you rub your face and body with the plants, they become impregnated with the substances (iridoids) that they release, acting as an insect repellent. The reason they prefer matatabi would be because it offers more reliable protection as it produces a more complex mixture of iridoids, especially when they nibble on the plant. That is to say, it is much better against mosquitoes.
Image | Sergey Dvorkin, Pexels
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