Near the streams lives a discreet bird, the Marsh warbler. Its fawn brown plumage on top and yellowish beige on the underside, combined with its habit of hopping beneath the foliage, make this bird difficult to spot. On the other hand, it can be easily detected thanks to its song (a medley of other birds). It is only found in Vanoise in the summer because it is an insectivorous and migratory bird, which feeds mainly on Diptera (flies) and some spiders.