SECONDARY SEXUAL CHARACTERS OF FISHES, AMPHIBIANS, AND REPTILES
FISHES: Courtship and battles of the males-Larger size of the females-Males, bright colours and ornamental appendages; other strange characters-Colours and appendages acquired by the males during the breeding-season alone-Fishes with both sexes brilliantly coloured-Protective colours-The less conspicuous colours of the female cannot be accounted for on the principle of protection-Male fishes building nests, and taking charge of the ova and young.
AMPHIBIANS: Differences in structure and colour between the sexes-Vocal organs.
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