Bumblebees experience positive and negative feelings, new study

Scientists have discovered that bumblebees react differently to pleasant and unpleasant tastes in a way that may reveal how they feel.

The new study, published in the journal Proceedings of the National Academy of Sciences (PNAS), found that bumblebees make different mouth and head movements after tasting food they like or dislike. The researchers say these reactions are similar to facial expressions seen in mammals.

When the bees tasted sweet, rewarding food, they often stretched out their tongue-like mouthpart after eating. When they tasted something unpleasant, they shook their heads or wiped their mouths.

The researchers found that these reactions were linked to how the bees evaluated the taste, rather than simply being automatic feeding movements.

Similar to mammals

Scientists have long used facial expressions in mammals to study emotions. For example, babies and other mammals often stick out their tongues after tasting something sweet and make different facial movements after tasting something bitter.

The researchers say the bumblebees’ reactions appear to serve a similar purpose. This suggests that insects may also be able to evaluate experiences as positive or negative.

The team also found that the bees’ positive reactions became stronger after they were given anandamide, a natural chemical that is part of the endocannabinoid system. In mammals, this system helps regulate pleasure, reward and other emotional processes.

The researchers say this does not prove that bumblebees experience emotions in the same way humans do. However, it provides new evidence that insects may have basic forms of affective evaluation. They have the ability to experience something as pleasant or unpleasant.

Bees are important

Bumblebees are important pollinators that help plants reproduce and support food production around the world.

The researchers believe their findings could help scientists better understand how feelings evolved across different animal groups. They also open new questions about insect welfare and how people think about the inner lives of animals with very different brains from our own.

The study adds to a growing body of research suggesting that insects may be more complex than previously believed.