Our focus is on free-lining birds in their natural habitats. Most of our recent work has be conducted in Southern California near Malibu, in Northern California near Volcano, and Southern Mexico at the Estacion Chajul of the Montes Azules Biosfere Reserve. Examples of their ambient acoustic environments are below. The species receiving most of our attention there have been California Thrashers, Cassin’s Vireos, Black-headed Grosbeaks and Mexican Ant Thrushes.