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TNC global conservation priority ranks (G ranks)

 

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TNC’s Heritage Program (Master 1991) ranks species as ‘critically imperiled’ (G1), ‘imperiled’ (G2), ‘rare or uncommon’ (G3), ‘apparantly secure’ (G4), and ‘widespread, abundant, and secure’ (G5), with borderline species denoted by two ranks. The application of these ranks to Latin American birds was carried out by S. Hilty and D. Stotz, who considered a total of 1,248 continental landbirds to fall into the ranks G1 through G3G4 and so be at risk (TNC 1998).