rm
is larger and stronger than the male, the psychic differences seem
very small. Among eagles and other allied forms, which are strictly
monogamous, the affection of the female for the male is so great that
she is said never to mate again if the male dies, and both watch over
and care for the young with extreme solicitude. The ostrich male form,
though perhaps larger than the female, shares with her the labour of
hatching the eggs, relieving the hen of her duty at a fixed hour daily:
and his care for the young when hatched is as tender as hers. Among
song-birds, in which the male and female forms are so alike as sometimes
to be indistinguishable, and which are also monogamous, the male and
female forms not only exhibit the same passionate affection for each
other (in the case of the South African cock-o-veet, they have one
answering love-song between them; the male sounding two or three notes
and the female completing it with two or three more), but they build the
nest together and rear the young with an equal devotion. In the case of
the little kapok bird of the Cape, a beautiful, white, fluffy round
nest is made by both out of the white down of a certain plant, and
immediately below the entrance to the cavity in which the little female
sits on the eggs is a small shelf or basket, in which the tiny male sits
to watch over and guard them. It is among certain orders of birds that
sex manifestations appear to assume their most harmonious and poetical
forms on earth. Among gallinaceous birds, on the other hand, where the
cock is much larger and more pugnacious than the female, and which are
polygamous, the cock does not court the female by song, but seizes her
by force, and shows little or no interest in his offspring, neither
sharing in the brooding nor feeding the young; and even at times seizing
any tempting morsel which the young or the hen may have discovered.

Among mammals the male form tends to be slightly larger than the female,
though not always (the female whale, for instance, being larger than the
male); the male also tends to be more pugnacious and less careful of the
young; though to this rule also there are exceptions. In the case of
the South African mierkat, for instance, the female is generally more
combative and more difficult to tame than the male; and it is the
males who from the moment of birth watch over the young with the most
passionate and tender solicitude, keeping them warm under their persons,