This special collection consists of a significant number of fossil remains of Myotragus balearicus Bate, an artiodactyl native to the Balearics whose extinction coincided with the appearance of the human population on the archipelago. The owner of the collection is DAMARC (Deià Museum that was founded by Dr. Waldren) and is permanently housed at the Museu Balear de Ciències Naturals for its correct conservation. All the material, currently in the process of Museum treatment and cataloguing, comes from the excavations carried out by William Waldren in the Muleta Cave (Sóller, Majorca, Balearic Islands). It is the most important collection of fossil remains of Myotragus balearicus Bate in the world due to the number of samples it contains.