FIGURES 9–12 in A new species of Formicivora antwren from the Chapada Diamantina, eastern Brazil (Aves: Passeriformes: Thamnophilidae)

FIGURES 9–12. The alarm call shared by: 9, Formicivora grantsaui sp. nov. (ASEC 10549); 10, F. r u f a (ASEC 3186); 11, F. acutirostris (MBBR s/no.); and 12, F. g r i s e a (ASEC 3011) presents a similar first note with a rapid descending frequency modulation followed by a second part, having up to three additional notes, whose structure is more variable among the several taxa. In F. grantsaui this final part most often has two very short notes (but see Figs. 13–14), while in the other species it always has only one note (window function Blackman, amplitude logarithmic, window size 533 samples, overlap 96.2%, DFT size 16384 points).