| North and Central America | South America |
| Adults | Immatures | Adults |
| Wing length | | | |
| Male | 174.4 ± 5.5 (157–186, 57) | 179.2 ± 8.5 (146–174, 11) | 176.1 ± 4.0 (169–181, 15) |
| Female | 171.4 ± 5.9 (155–181, 55) | 165.5 ± 10.0 (154–173, 3) | 168.8 ± 5.2 (160–178, 13) |
| Tail length | | | |
| Male | 69.9 ± 7.4 (30–81, 49) | 66.1 ± 3.7 (61–75, 10) | 71.0 ± 4.2 (62–78, 15) |
| Female | 68.9 ± 6.0 (43–80, 48) | 66.0 ± 2.4 (63–68, 3) | 68.8 ± 4.7 (59–75, 12) |
| Tarsus length | | | |
| Male | 58.9 ± 3.4 (52–73, 55) | 56.8 ± 4.4 (52–67, 12) | 60.4 ± 3.8 (50–66, 15) |
| Female | 57.3 ± 2.5 (51–62, 50) | 55.9 ± 1.5 (54–57, 3) | 57.9 ± 2.6 (53–60, 12) |
| Bill and shield length | | | |
| Male | 47.6 ± 2.4 (42–53, 56) | 41.7 ± 1.9 (39–45, 12) | 48.7 ± 2.3 (46–54, 15) |
| Female | 44.8 ± 2.4 (36–50, 50) | 40.7 ± 1.7 (39–42, 3) | 46.5 ± 4.4 (42–58, 13) |
| Middle toe and claw length | | | |
| Male | 75.7 ± 3.2 (70–84, 31) | 73.1 ± 4.1 (66–78, 6) | 76.5 ± 2.7 (73–81, 9) |
| Female | 73.9 ± 3.0 (69–81, 25) | 73.6 ± 1.5 (73–75, 2) | 72.5 ± 2.6 (68–76, 10) |
| Mass | | | |
| Male | (203–269) | | |
| Female | (213–291) | | |