Panther chameleon, Furcifer pardalis, submissive male (right) gives way to dominant male (left). Submissive male's colour fades, dominant male's colour brightens.

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Photo credit: © Dorling Kindersley: Gary Ombler / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: bluff, challenge, change, colour, competition, conflict, crimson, dispute, intrasexual, lizard, male-male, reptile, rivalry, territory, threat, turquoise, vibrant