A narrow street decorated for a festival with large, colorful papier-mâché sea creatures hanging overhead, including several Nautilus figures with striped shells. Bright fabric shades in purple, black, and green are strung above, while additional decorations such as flowers and lizards adorn the sides. Apartment balconies and building facades line the street.
A man wearing a headset microphone is giving an outdoor science talk, pointing at a large screen showing an image of the flatworm Macrostomum lignano. The slide text reads "Separate sexes are not a given," with labels pointing to "Testes producing sperm" and "Ovaries producing eggs." Festival decorations, including colorful paper flowers and geometric designs, hang in the background, and people are gathered to watch.
Amazing evolutionary biology outreach at the Fiestas de Gràcia in Barcelona.
@rawwiberg.bsky.social explained that not everything we assume about sex is a given and that we can learn a lot from the exceptions.
#ESEB25