Grèbe huppé (Podiceps cristatus) couvant dans son nid sur un lac jurassien (Jura (39), France). Prise de vue mi-air mi-eau montrant la structure du nid sous la surface de l'eau. / Great-crested Grebe (Podiceps cristatus) sitting on its eggs in a Jura lake (France). Photograph taken with a semi-immersed camera showing the nest structure. The Grebe breeds on lakes, slow rivers, gravel pits.