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Change in appearance during mating season at lizards, amphibians, and fish (sexual dimorphism): 1) Flying dragon (Draco volans); 2) Oriental garden lizard (Calotes versicolor); 3) Western green lizard (Lacerta bilineata); 4) Butterfly blenny (Blennius ocellaris); 5) Common dragonet (Callionymus lyra); 6) Three-spined stickleback (Gasterosteus aculeatus); 7) European bitterling (Rhodeus amarus); 8) Northern crested newt (Triturus cristatus); 9) Alpine newt (Ichthyosaura alpestris). a = Colouring of the male during the mating, b = Normal colouring of the male. Chromolithograph, published in 1897.