The conservation and preservation of biodiversity, its global and fair use, ensures the survival of the planet and ultimately ours. Taken into account the tools provided by scientific and technological developments and increasing concern for environmental conservation, it is of great relevance to identify appropriate technological tools for environmental sustainability. Moreover it is essential establishing certain protocols for their implementation and use. For this reason specialists in intelligent automatic systems, in biology and engineers have been working together for several years in this issue. This paper presents the first steps towards the development of a biometric system based on ultrasound for identification of bat calls in the Basque Country. They have been carried out three different kind of identification with regard to: specie, individual and behaviour.