“…These monitoring programs (except for CBC) use point counts (Blondel et al, 1970;Bibby et al, 2000) and have been refined and well-studied in temperate latitudes (Shields, 1977;Ralph & Scott, 1981;Skirvin, 1981;Verner & Ritter, 1986;Ralph et al, 1995). Recently, point counts have been used in Neotropical regions to improve the results obtained while using such method (Esquivel & Peris, 2008;Volpato et al, 2009). However, few studies have addressed the issue that point counts, being stationary for limited time, tend to miss non-vocal, rare or canopy species, or provide biased estimates of abundance and can be influenced by environmental features (Verner, 1985;Terborgh et al, 1990).…”