Last March (2018), in a routine survey by the Biodiversity Monitoring Team, the arrival of a large number of cnidarians was observed: "Atlantic Portuguese man o'war"(Physalia physallis) and " " (Velella velella). These species covered large beach surface. These arrivals are motivated by the lack of locomotion of these species, wich move adrift - transported by currents - and thus strong storms push them off the coast. As an anecdote, 120 "Atlantic Portuguese man o'war" were counted in a track of 100 meters . Conversely, the great abundance of " " and its small size made it impossible to count them.