In September of this year, the National Museum of Natural History in the Netherlands (NCBnaturalis), will host an exhibition about cetaceans; part of this exhibition is international and touring Europe (currently it is in Bruxelles). But the Museum will add its own touches: among other things we will put skeletons of six species from the collection on display and of those cetacean species we would like to obtain some sound material if available. Chris Smeenk and I are somewhat involved with ideas/advise for this exhibition, hence our request. 1) Right Whale (Eubalaena glacialis or E. australis) 2) Orca (Orcinus orca) 3) Common dolphin (Delphinus delphis) 4) Pygmy sperm whale (Kogia breviceps) 5) Narwhal (Monodon monoceros) 6) Northern Bottlenose whale (Hyperoodon ampullatus) The intention is to use some of the sounds of the species mentioned above as a background display in the exhibition. If you do have material available and are willing to help us please contact me with the information about what kind of material you have available and what the conditions of using your material would be. I will than put you in touch with the exhibition developers at my institute for whom I have made this request. Regards, Marjan Addink NCBnaturalis Marian.Addink@ncbnaturalis.nl