Dreams, possible source of the belief in spiritual agencies.
Drill, sexual difference of colour in the.
Dromaeus irroratus.
Dromolaea, Saharan species of.
Drongo shrike.
Drongos, racket-shaped feathers in the tails of.
Dryness of climate, supposed influence of, on the colour of the skin.
Dryopithecus.
Duck, harlequin, age of mature plumage in the; breeding in immature
plumage.
Duck, long-tailed, preference of male, for certain females.
Duck, pintail, pairing with a widgeon.
Duck, voice of the; pairing with a shield-drake; immature plumage of
the.
Duck, wild, sexual differences in the; speculum and male characters of;
pairing with a pin-tail drake.
Ducks, wild, becoming polygamous under partial domestication; dogs and
cats recognised by.
Dufosse, Dr., sounds produced by fish.
Dugong, nakedness of; tusks of.
Dujardin, on the relative size of the cerebral ganglia, in insects.
Duncan, Dr., on the fertility of early marriages; comparative health of
married and single.
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