Platalea, change of plumage in.
Platyblemus.
Platycercus, young of.
Platyphyllum concavum.
Platyrrhine monkeys.
Platysma myoides.
Plecostomus, head-tentacles of the males of a species of.
Plecostomus barbatus, peculiar beard of the male.
Plectropterus gambensis, spurred wings of.
Ploceus.
Plovers, wing-spurs of; double moult in.
Plumage, changes of, inheritance of, by fowls; tendency to analogous
variation in; display of, by male birds; changes of, in relation to
season; immature, of birds; colour of, in relation to protection.
Plumes on the head in birds, difference of, in the sexes.
Pneumora, structure of.
Podica, sexual difference in the colour of the irides.
Poeppig, on the contact of civilised and savage races.
Poison, avoidance of, by animals.
Poisonous fruits and herbs avoided by animals.
Poisons, immunity from, correlated with colour.
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