There are many types of plants that can be found on the island (more than 760 species of wild flowers, like the white asphodelus which sprouts in April on the moor). This wide range of plants offers a colourful space or blooming all year round.
One encounters easily the French carnation (national protected flower) or the helianthemum, rock rose, but in just one day you can also easily discover a sand dune wallflower, a protected sea holly or a patch of bluebells.
16 types of orchids, some very rare, bloom from March to September, for example, the protected serapias linguae.
Coast, marshes and wetlands provide nesting and rest-stop habitat for about 290 bird species.
Flying over the seas, many migrating seabirds (skuas, razorbills, puffins, gannets,…) cross over the island during autumn. In winter, shorebirds or waders (sandpipers, plovers, ringed plovers, …) choose long sandy beaches for feeding. Autumn is the best time to observe the shy purple sandpiper or the rare wadepiper. In spring, warblers return from Africa and the marsh harrier soars in the sky searching for a mate. Many species rarely observed in West Europe can be admired during spring or autumn (lapland longspur, little bunting). As for the insects, the number of butterflies is outstanding. An islander vole, sort of field mouse, is typically from the island, its latin name coming from the latin name of the island "Oyensis".
Last but not least, marine wildlife, with the more common european conger, needle fish or spidercrab, as well as the most sought after sea bass, sea bream or lobster.