Copied from Poul Anderson Appreciation, 18 Sept 2014.
See here.
Large
flying animals evolved in the dense Diomedean atmosphere. Flocks of
intelligent Diomedeans winter in the tropics. The exertion of a long
flight causes hormonal changes so that, upon arrival, there is a mating
orgy. Females are pregnant when they return home in spring and give
birth before the next migration when parents carry infants who can fly
independently the following year.
Towns, vacated every
autumn but reoccupied every spring, are centers of stone working,
ceramics, carpentry and limited agriculture although the main economic
activities are hunting and herding. The Great Flock of Lannach is
indolent, artistic, ceremonious and matrilineal whereas Diomedeans of
the Fleet of Drak'ho have abandoned annual migration in favor of fishing
and seaweed harvesting from large, oceangoing rafts where the exertion
of navigational activities exercises the body, maintaining year-round
sexuality and reproduction and patriarchal monogamy. The Fleet, able to
accumulate stores, machines and books, is richer but authoritarian.
On Starkad (see here),
land-dwelling and sea-dwelling intelligent species were natural
enemies. On Diomedes, Flock and Fleet are the same species but initially
regard each other with mutual horror although extra-planetary traders
encourage tolerance and cooperation. In the Imperial period, Drak'ho can
adapt to living on land and to engaging in new economic activities
whereas the migratory Lannachska culture, used to summer time indolence,
cannot survive the introduction of high-energy technology but, without
it, must remain poor and powerless.
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