Curlews, double moult in.
Cursores, comparative absence of sexual differences among the.
Curtis, J., on the proportion of the sexes in Athalia.
Cuvier, F., on the recognition of women by male quadrumana.
Cuvier, G., on the number of caudal vertebrae in the mandrill; on instinct and intelligence; views of, as to the position of man; on the position of the seals; on Hectocotyle.
Cyanalcyon, sexual difference in colours of; immature plumage of.
Cyanecula suecica, sexual differences of.
Cychrus, sounds produced by.
Cycnia mendica, sexual difference of, in colour.
Cygnus ferus, trachea of.