Scientists have used slow-motion video to capture miniature facial expressions in bumblebees when they taste different solutions, revealing behaviors that resemble 'liking' or 'disliking'. The study, published in the journal Proceedings of the National Academy of Sciences, shows bees reacting to droplets of water containing sugar, salt, quinine, or plain water.
Bees' 'liking' and 'disliking' responses
When presented with a sugar solution, bees extended their glossa (tongue) briefly, similar to a lip-licking motion. In contrast, when tasting quinine or salt, they shook their heads and wiped their mouths. These responses were consistent across multiple trials, suggesting a form of subjective experience.
Implications for insect inner lives
The findings raise questions about whether bees have inner lives or emotional states. According to the researchers, these facial expressions may indicate positive or negative valences, challenging assumptions about insect cognition. The study provides a new tool for assessing insect welfare and understanding their behavior.
