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Updated: June 26, 2025
When we treat of Birds, we shall see that they present in their secondary sexual characters the closest analogy with insects. Thus, many male birds are highly pugnacious, and some are furnished with special weapons for fighting with their rivals. They possess organs which are used during the breeding-season for producing vocal and instrumental music.
The sounds produced by fishes are said in some cases to be made only by the males during the breeding-season. All the air-breathing Vertebrata necessarily possess an apparatus for inhaling and expelling air, with a pipe capable of being closed at one end.
The males of certain birds may occasionally be heard pouring forth their love-song long after the proper time, shewing that they have either lost or never gained a mate. Death from accident or disease of one of a pair would leave the other free and single; and there is reason to believe that female birds during the breeding-season are especially liable to premature death.
Throughout the following discussion I use the term in the same sense as when naturalists speak of animals as monogamous, meaning thereby that the male is accepted by or chooses a single female, and lives with her either during the breeding-season or for the whole year, keeping possession of her by the law of might; or, as when they speak of a polygamous species, meaning that the male lives with several females.
The males of Cantharus lineatus become, during the breeding-season, of deep leaden- black; they then retire from the shoal, and excavate a hollow as a nest. "Each male now mounts vigilant guard over his respective hollow, and vigorously attacks and drives away any other fish of the same sex.
With defenceless species, in which both sexes, or the males alone, become extremely conspicuous during the breeding-season, or when the males acquire at this season such long wing or tail-feathers as to impede their flight, as with Cosmetornis and Vidua, it certainly at first appears highly probable that the second moult has been gained for the special purpose of throwing off these ornaments.
Waterton's 'Wanderings, p. 118. See also Mr. The coloured plumage and certain other ornaments of the adult males are either retained for life, or are periodically renewed during the summer and breeding-season. At this same season the beak and naked skin about the head frequently change colour, as with some herons, ibises, gulls, one of the bell-birds just noticed, etc.
Every one knows how much birds use their vocal organs as a means of courtship; and some species likewise perform what may be called instrumental music. In the class of Mammals, with which we are here more particularly concerned, the males of almost all the species use their voices during the breeding-season much more than at any other time; and some are absolutely mute excepting at this season.
I have not myself seen the Yellow Wagtail in either of the Islands during my summer visits in 1866, 1876, or 1878; so it certainly cannot be very common during the breeding-season, or I could scarcely have missed seeing it. Professor Ansted has not included it in his list, and there is no specimen at present in the Museum. TREE PIPIT. Anthus trivialis, Linnaeus.
Most male birds are highly pugnacious during the breeding-season, and some possess weapons adapted for fighting with their rivals. But the most pugnacious and the best armed males rarely or never depend for success solely on their power to drive away or kill their rivals, but have special means for charming the female.
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