>>29679
So basically, rabbits are fluffy
Rabbit fur is an extremely good insulator, such that you can easily see rabbits playing in snow despite having such a high surface area:volume ratio. They don't sweat (and don't dry out properly unless it's really really dry, which is why they die if they get wet on a cold humid day), and primarily thermoregulate down through breathing (like panting). If air temperature is higher than their body temperature (~everything has the same body temperature, the upper limit is cellular), the only real way to cool a rabbit down is by just pressing cold things against it. In the case of the image, the bottle on the left is doing next to nothing wheras the bottle actually in contact with it would be helping. Only a little though, but the room also doesn't look like it's actually hot. When a rabbit wants to cool down, it'll lie flat on it's belly (like the rabbit on the bottle) and this squishes up all the fur and makes thermal conduction viable when normally there would just be an impregnable layer of warm air.
That rabbit looks like it's about to walk away so I'm assuming someone just picked it up out of it's cage, put it on the table(?) and pushed the bottles up against it and quickly took the picture before it started to wander off.