Figure 1 From: Knee-clicks and visual traits indicate fighting ability in eland antelopes: multiple messages and back-up signals A lateral photo of a mature eland bull indicating the measures taken: (1) body depth, (2) horn length, (3) dewlap droop, (4) frontal brush size, (5) darkness of the facemask, (6) greyness of the body, and (7) knee-click frequency. Back to article page