This document discusses various aquatic ecosystems and species including coral reefs like the Great Barrier Reef in Australia, invertebrate animals with exoskeletons such as sea anemones and sea sponges, rocky shores and flat shores, seabirds like albatrosses and seagulls, molluscs and their feet, piranhas in the Amazon River, wetlands like those found in Doñana National Park and Las Tablas de Daimiel National Park in Spain, and cranes often seen in wetland areas.

1. AQUATIC ECOSYSTEMS

2. CORAL REEFS

3. GREAT BARRIER REEF IN AUSTRALIA

4. Exoskeletons of invertebrate
animals

5. SEA ANEMONES

6. SEA SPONGES

7. ROCKY SHORES

8. FLAT SHORE

9. ALBATROSSES

10. SEAGULLS

11. Foot of a mollusc

12. PIRANHAS OF THE AMAZON

13. WETLANDS
(HUMEDALES)

14. DOÑANA NATIONAL PARK, HUELVA, CÁDIZ
AND SEVILLA

15. LAS TABLAS DE DAIMIEL NATIONAL PARK,
CIUDAD REAL

16. Las Tablas in draught
period

17. CRANE