It's feeding time!!

Today the sea conditions were not perfect but nothing that prevented us from going out to visit our common dolphin friends. They were feeding together with a large group of seagulls. We tried to listen to them with the hydrophone, but it was not possible to hear them. As we had already seen them well we set out on the adventure in search of new species. As we advanced, we stopped and we tried the hydrophone, but nothing... absolute silence! Today or they were shy and they were not communicating or they were too far away and we could not detect them.