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| Character | Description |
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| 1 | Plumage-Color | Dimorphic scored for obvious differences between the sexes in coloration (subtle differences, such as slightly brighter in males or more extensive spotting in one sex were scored as monomorphic) |
| 2 | Plumage-Tail Length | Dimorphic scored when tail (or tail coverts) was much longer or modified in males relative to female tail |
| 3 | Plumage-Head Ornaments | Dimorphic scored if ear tufts, crests, or capes either present in males or larger in males |
| 4 | Plumage-Other | Dimorphic scored if male plumage exhibits iridescence or modified feathers not covered in other categories |
| 5 | Plumage-Elaboration | Dimorphic scored if the male plumage pattern or color is dramatic and very obvious relative to female plumage |
| 6 | Fleshy Traits | Dimorphic scored if one sex larger or obviously brighter than the other; since the goal was to explore sexual selection on these traits, the appearance of the trait when displayed was scored |
| 7 | Spurs | Dimorphic scored if males had more spurs than females, or in a few cases male spurs noticeably longer than female spurs |
| 8 | Wing Length | Dimorphic if at least a 5% difference between the sexes (following Höglund [20]). Used average wing length if given; if only a range was given, then the midpoint of the range was used for calculations) |
| 9 | Body Size | Dimorphic if species noted as having larger males or smaller females; scored as monomorphic if differences were noted as slight (weight was not used as many measures in the literature taken from captive individuals and/or dead specimens whose weight may not be representative) |
| 10 | Any Plumage | Scored as one if dimorphic in any of the five plumage traits |
| 11 | Any Competitive | Scored as one if dimorphic in either spurs, wing length, or body size |
| 12 | High Plumage | Scored as one if the species exhibited dimorphism in at least three of the five plumage characters |
| 13 | High Competitive | Scored as one if the species exhibited dimorphism in at least two of the three competitive characters |
| 14 | Total | Sum of all characters scored as dimorphic in a species |
| 15 | Total Signal | Sum of the plumage and fleshy trait dimorphism, both of which are used in visual displays |
| 16 | Total Competitive | Sum of spur, wing, and body size characters scored as dimorphic |
| 17 | Total Plumage | Sum of the five plumage characters scored as dimorphic |
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