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- Rays, animals with an electric charge, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Octopuses, underwater jet propulsion, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Sponges, filters of the sea, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Mussels, hard-shelled mollusks, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Whales, giant marine mammals, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Crustaceans, armored omnivores, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi
- Dolphins, animals with sonar, by Andreu Llamas ; illustrated by Gabriel Casadevall and Ali Garousi