SOCIOBIOLOGY
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even if he did not fully articulate it. Reciprocal al-
truism works on the principle that when an organ-
ism gives help, it is entitled to receive help when
needed. Reciprocal altruism can work even among
non-relatives, or—at the extreme—across species.
Certain fish are major predators, but they tolerate
other types of fish that swim directly into their
mouths and pick out harmful bacteria and fungi on
their gums. The predators practice dental hygiene
and the cleaners get a good meal because the
larger fish does not swallow the smaller fish in its
mouth. Everyone benefits.
Evolutionary equilibrium. Evolutionists turned
to game theory in cases where participants adopt
various strategies to succeed in the light of the fact
that other players (in biological terms, other mem-
bers of the species) are also trying to succeed. In
The Selfish Gene (1976), a provocative populariza-
tion of this theory, British biologist Richard
Dawkins showed how certain evolutionary situa-
tions achieve equilibrium, or reveal what he called
“Evolutionary Stable Strategies,” when no one
member of the group can achieve more than lim-
ited benefits, given the conflicting interests of the
group. To take one of Dawkins’s examples, con-
sider a group with two kinds of members. Some
members of the group are “hawks,” who in any
potential conflict situation are aggressive and will
fight if need be. Others in the group are “doves,”
who always run if a fight looms. One might as-
sume that the hawks would dominate and that se-
lection would produce a population without any
doves. But this is not so. A hawk’s encounter with
another hawk always leads to a fight, which may
end with one hawk injured or dead. Doves, how-
ever, never get beaten up because they run. So, on
average, there is a cost to being a hawk. But doves
cannot dominate either, because, on average, there
is a cost to being a dove. Hawks always win con-
frontations between a hawk and a dove. The birds
of the group therefore end up in a balanced if un-
comfortable midpoint, with neither hawks nor
doves able to increase their representation at the
expense of the other.
Armed with these theories, naturalists and ex-
perimentalists turned to the larger world to deter-
mine if they could understand the social behavior
not just of insects and fish, but of more complex
animals like birds and mammals. The widest range
of topics was covered. Notable was a study (led by
Cambridge biologist Tim Clutton Brock) of red
deer on an island off the coast of Scotland that
showed how male deers strive to capture harems
and will compete (or not) as it proves to be in
their interest, and how female deers, which seem
to be controlled by males, will in turn employ
tricks and strategies to improve their reproductive
options and results. A female wants her offspring,
particularly her sons, sired by a male who will pas
on his superior breeding qualities. Another study
(conducted by Cambridge biologist Nicholas
Davies) looked at the dunnocks (hedge sparrows),
a bird that has the widest of breeding patterns—
monogamy, polygyny (one male, several females),
polyandry (one female, several males), and some-
thing primly referred to as polyandryny (group
sex, with several males and several females). By
doing DNA fingerprinting on the birds and their
offspring, researchers could trace relationships,
demonstrating just how much behavior was con-
trolled by reproductive interests. This study re-
vealed that dunnocks do not raise chicks with
whom they have little reason to think they have
real blood ties. Moreover, a dominant male (an
“alpha”) will tend to spend more time chick rearing
and to have more offspring than a lesser male (a
“beta”). Another study in Holland (reported by
ethologist Franz de Waal) looked at relationships
within a troop of chimpanzees—how males
needed female help to dominate a situation, and
how different alliances would be formed according
to different interests. Two weaker males might pre-
fer to gang up to defeat a stronger male, rather
than simply acting individually.
Edward O. Wilson. Research went ahead with
speed and enthusiasm, and before long, the sci-
ence of the evolution of social behavior—now
called sociobiology—was ready to take its proper
place in the Darwinian family, along with paleon-
tology and the other subjects. But controversy
loomed. Darwin had wanted to apply his ideas to
humans, and in the The Descent of Man (1874) he
did just that, as did Darwinian scientists who came
later, in particular, Harvard entomologist Edward
O. Wilson. In a major overview of the field, Socio-
biology: The New Synthesis (1975), and later in a
work addressing the human species, On Human
Nature (1978 ),Wilson argued that nearly every as-
pect of human life and nature is a function of bi-
ology, or, more accurately, the genes as fashioned
by natural selection. Sexual differences, family