Step;"Step 1";"Step 2";"Step 3";"Step 4";"Assigned individual code" "Morphological key";"Adult or subadult/offspring";"Horn shape";"Proportion of horn ring";" Facial colour pattern" Code;"adult or subadult";A;(1–8);(a–e);(Ⅰ–Ⅹ);A-(1–8)-(a–e)-(Ⅰ–Ⅹ) Offspring;Y;"Invisible small horn (I)";"Not applicable (*)";"Y-(I or V)-*-(Ⅰ–Ⅹ)" "Visible small horns (V)"