A rat can "catch" a cagemate's food preference: what a classic study shows
A rat doesn't need to taste an unfamiliar food itself to form a preference for it: a simple contact with a cagemate who just ate it is sometimes enough to steer its choice. Find our ideas for varying its diet in the rodent food section.
A founding experiment on sharing food information
Galef and Wigmore published a study on the transfer of information about distant foods in rats in the journal Animal Behaviour in 1983 (research on Google Scholar). After a brief interaction with a cagemate who had just eaten a particular food, without ever seeing or smelling that food directly, an "observer" rat began to prefer that same food when offered a choice, even when the food itself sat in a completely different location from where the interaction took place.
How does this information travel between two rats?
The authors attribute this transfer to olfactory cues carried on the breath and coat of the cagemate that has just eaten: close contact, especially around the muzzle, is enough to pass on a chemical signature tied to the food consumed. The observer rat needs neither to see the food nor to taste it itself for the preference to take hold.
What this means for introducing a new food
This mechanism offers a practical lever for an owner trying to diversify the diet of a cautious rat: offering a new ingredient first to a more experienced cagemate, then letting the two animals interact normally, often makes it easier for the more reluctant rat to accept it. Our fancy rat diet guide covers the right proportions for introducing new ingredients without unbalancing the ration.
- Feed the group's rats together rather than in separate spaces, so this kind of exchange can happen naturally.
- Introduce a new rat to the group's existing diet rather than trying to impose its own previous eating habits right away.
- Don't expect an instant effect in a rat kept very socially isolated: the mechanism relies on real social contact, not just ambient cage odor.
This phenomenon usefully complements what's already known about food neophobia in rats: an innate wariness of novelty combines with this ability to rely on a cagemate's experience to assess a food without personal risk.
Frequently asked questions
Does this mechanism also work for a rat living alone?
No, it requires direct social contact with a cagemate that has itself eaten the food; a rat housed alone can't benefit from it in the same way.
Should contact between two rats be forced to speed up the effect?
No, spontaneous interactions during meals or rest are enough; there's no need to arrange a dedicated encounter.
Does this transfer guarantee the rat will like the food?
No, it only raises the odds it will try it without excessive reluctance; the final taste preference still varies by individual. Find all our guides on the rodent hub.
This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.