DTBird in cooperation with the Spanish Wildlife Recovery Center (GREFA) and the Animal Medecine and Surgery Veterinarian Faculty of the Complutense (Spanish University) has tested the hearing of the following bird species: Aquila Chrysaetos, Falco tinnunculus, Gyps fulvus and Milvus milvus.

The Audiogram Plots of these species will be used to create new species-specific collision avoidance sounds and to adjust the design of speaker's location and sound levels emitted, customized for both target species and wind turbine dimensions.

The bird's hearing research is still open to add more species and individuals.