Among the more than 450 different species that live in the Barcelona Aquarium are some quite curious speciments, with poisonous stingers, rotating eyes, changing colours, sequential hermaphroditism, and other oddities. To introduce the public to these 'Stranger fish', the Aquarium has organized a programme of family activities every weekend from the end of September to mid-December. For example, with 'Ray feeding times', you can observe how the rays feed while caregivers explain their characteristics. If you want, once in L'Aquàrium you can register for the guided tour 'A sea full of stranger fish' to discover the most amazing aspects of the beings that live in the Mediterranean and tropical aquariums while solving a game of clues. There's also face painting, and the 'Design your own flextangle' workshop, where kids can learn by colouring, cutting and pasting a flextangle they can take home with them.