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. REPTILES:
Chelonians--Crocodiles--Snakes, colours in some cases
protective--Lizards, battles of--Ornamental appendages--Strange
differences in structure between the sexes--Colours--Sexual
differences almost as great as with birds Page 1-37