The evolution of fatherhood
© 2010 - 2013 Gwen Dewar, Ph.D., all rights reserved
In popular accounts of evolutionary psychology, men are cads.
Males--the story goes--maximize their reproductive success by mating with as many females as possible.
If they can’t get extra mating opportunities, then males might
make the best of a “bad" situation by supporting their kids--assuming
they can be sure of paternity.
But, as a rule, males are expected to invest more in mating than
in parenting. By spending “too much" of their resources on kids, males
lose opportunities to spread their genes far and wide.
Cynical? Silly? It isn’t complete nonsense.
It’s true that females—especially female mammals—invest more energy in parental care.
It’s true that female reproductive success is less limited by the
number of partners a female has and more limited by the amount of food
she can acquire.
It’s also true that females have little trouble identifying their
own offspring, and that males are more likely to offer parental care
when they can be confident of paternity.
But the pop psychology account of fatherhood –i.e., that males
are designed by nature to avoid fatherly responsibilities—is simplistic
Human fatherhood is extremely variable. In some societies, men
provide very little parental care. Remove them altogether and little
changes in the lives of their children.
In other societies, good fathers play a crucial role. Their
economic support makes a big difference. Their emotional support can,
Furthermore, these men really want to support their children. And, not surprisingly,
men who like children are more attractive to women.
Are these human males an aberration of nature? Hardly.
Ninety percent of bird species are monogamous. In most of these
species, males share equally in providing food and protection to their
nestlings. Take these males away and the offspring usually suffer. The
chicks are less likely to survive, and if they do survive, they don’t
grow as large (Wolf et al 1988).
Paternal care among mammals is far less widespread. The weirdest, most newsworthy discovery is that some male fruit bats lactate. Do they actually feed infants? It’s plausible, but still unconfirmed (Kunz and Hosken 2008).
What’s not controversial is that helpful fathers are relatively
common among certain groups of mammals. Among the primates and the
carnivores, up to 40% of genera show some form of paternal care (Kleiman
and Malcolm 1981).
In wolves, foxes, and wild dogs, this paternal care is direct and
crucial. Fathers share with mothers the tasks of hunting, feeding,
cleaning, and protecting the cubs. They play with their cubs, too
And among some monogamous New World monkeys, fathers perform
similarly important roles. Marmoset and tamarin fathers carry their
young on their backs and share food. Owl monkeys, titi monkeys, and
Goeldi’s monkeys do the same (Shradin et al 2003).
Other cases of paternal care are less dramatic, but still notable.
Male Coquerel’s sifakas, made famous by the preschool TV show
"Zooboomafoo," have been observed grooming and holding infants (Bastian
and Brockman 2007). In other lemur species, fathers guard and babysit
their young (Vasey 2007; Fietz and Dausmann 2003).
--who aren't known for paternal care--fathers may protect infants from attack by other, infanticidal males.
Old World monkeys provide these protective services as well. And
in one group of savannah baboons, researchers found that males were more
likely to support youngsters involved in daily squabbles if they were
the genetic fathers of those juveniles (Buchan et al 2003).
What about our closest living relatives--the African apes?
Gorilla fathers are protective and playful with their offspring, but
that's as far as it goes. Chimpanzee and bonobo males are uninvolved.
And that underscores an important lesson for understanding the evolution of fatherhood in humans:
When we look for comparative data about behavior, we don’t
necessarily find the most instructive parallels amongst our closest
Behavior evolves rapidly, so that two closely-related species may
show dramatic differences in behavior. And quite distantly-related
species may show remarkable behavioral similarities—if they encounter similar ecological conditions.
So when it comes to paternal care, the devoted dad who feeds
his kids and walks them to school each day has more in common with a
wolf than a chimpanzee.
Perhaps even more importantly, individuals can respond flexibly
to local conditions. Some situations make it easier or more rewarding
for men to support their children.
By studying different local environmental conditions, we may
better understand why some men act like fatherly wolves and others act
more like aloof chimpanzees.
This is the work of behavioral ecologists and biological
anthropologists, and you can read about it in a new book by Peter Gray
and Kermyt Anderson.
Fatherhood: Evolution and Human Paternal Behavior
In Fatherhood: Evolution and Human Paternal Behavior , Gray and Anderson review paternal behavior around the world and consider the patterns that emerge.
They begin with a brief overview of fatherhood in nonhuman
primates and a discussion of how anthropologists are reconstructing the
family life of our ancestors.
Then, with an emphasis on Western society, they cover topics like
marriage, fertility, paternity, cross-cultural studies of father
involvement, stepfathering, sexuality, health, and the biochemical
changes that babies make to a father’s brain.
Gray and Anderson note that the old view of the hunter-gatherer
family—that fathers hunt to provide meat for their kids—has been
overturned by recent research on contemporary foragers.
Men hunt, but their kids don’t get any special benefits from it.
The hunters share their meat equally with everyone in the camp. And a
hunter’s motivation has more to do with building a reputation among
other adults—and attracting potential mates—than with feeding their
Nevertheless, hunter-gatherer men are some of the most involved fathers in the world.
During the first year of an infant’s life, mothers are least able to forage for themselves.
Fathers bring home extra calories—including meat, honey, and
plant foods—and their contributions may be crucial if the mother lacks
the help of other close kin (Marlowe 2005).
Hunter-gatherer men are also relatively involved in child care, spending about 5% of their time holding infants.
Overall, hunter-gatherer fathers have more intimate (and less
domineering) relationships with their kids than do men from
horticultural, agricultural, and herding societies. These latter
societies are not likely to meet with the approval of the modern,
sensitive, involved dad. Fathers are distant. Their main roles seem to
concern discipline, status, and providing vocational training to their
They don't always provide much economic support, either.
In one analysis of cross-cultural data, researchers found that in
68% of the societies sampled, the death of a father had no impact on
his children’s survival. In general, grandmothers were more important
(Sear and Mace 2008).
So what accounts for the differences between hunter-gatherer men and men in other traditional societies?
Cross-cultural analysis (e.g., Katz and Konner 1981; Hewlett
1992; Marlowe 2000) suggests that hunter-gatherer men show higher father
• Females tend to contribute a large portion of calories to the
diet (which among other things means that mothers need more help with
• Husbands and wives spend more time together (foraging, sleeping together, eating together, etc.)
• Most marriages are monogamous (not polygynous, so children
don’t have to share their fathers with children produced by other wives)
• Men spend less time engaged in warfare (which takes them away
from their families and may socialize them in ways that are inconsistent
with sensitive, involved fathering)
• Men don’t accumulate much wealth (when they do, they are more
likely to take multiple wives and engage in warfare to defend their
Gray and Anderson don’t discuss all these factors in depth. Instead, they give considerable attention to these issues:
Men contribute less paternal care when they aren’t married to the
children’s mothers. After a divorce, some men retreat from their
children’s lives, but the stereotype of the deadbeat dad is misleading:
The same dads that refuse to pay child support are usually men who
provided little support before they got divorced.
Confidence of paternity
Contrary to what some studies have suggested, men who are confident
about paternity are usually correct. And not surprisingly, American men
who have doubts about paternity are less likely to support the kids.
What might interest you more is the way that some cultures have
adapted to the problem of low paternity confidence. In cultures were men
are less likely to be the genetic fathers of their wives’ children, men
channel their wealth to their nephews or nieces, not their putative
offspring (e.g., Hartung 1985).
Even more remarkable is the tradition of “partible paternity," in which
“primary" fathers share paternal responsibility with other, “secondary" fathers.
Hormones don’t affect mothers only. Fatherhood is associated with hormonal changes, too.
Studies suggest that men involved with the care of young children experience a drop in testosterone levels (Gettler et al 2011; Gettler et al 2012).
Men exposed to infants may also experience elevated levels of
prolactin, the hormone that stimulates parental behavior in a variety of
birds and mammals. And dads with higher prolactin levels are more
responsive to babies (Fleming et al 2002). So it seems that there is a
positive feedback loop. Fathers who live intimately with children become
more biologically prepared and willing to take care of them.
If hormones intrigue you, you’ll enjoy Gray and Anderson’s chapter on the ways that parenthood and infants alter a man’s brain. And of course the transition to parenting isn’t only about happy effects. Gray and Anderson discuss disruptions, too. Like mothers, fathers may suffer from postpartum depression, especially if their spouses are depressed. There is also evidence that living with an infant inhibits a man’s sex drive.
More about the evolution of fatherhood
Gray and Anderson’s accessible, conversational book will appeal to readers interested in a broad look at the consequences of fatherhood for both children and men, particularly if your focus is on men living in modern Western societies.
And there's more good stuff to read about the anthropology and evolution of fatherhood.
Behavioral ecologist Sarah Blaffer Hrdy is well-known for her cooperative breeding hypothesis. She is also an outstandingly clear and engaging writer.
In her book, Mothers and Others: The Evolutionary Origins of Mutual Understanding , Hrdy presents a compelling argument for the idea that humans evolved in the context of communal child care.
Her chapter “Will the real Pleistocene family please step
forward?" is an excellent overview of the variable role of fathers and
includes an extended discussion of the physiological effects of child
care on men.
There you will also find a fascinating discussion of “partible
paternity" in more than one man claims paternal responsibility for the
same child. This occurs among several different peoples of the Amazon
basin, in societies where fathers contribute crucial calories to their
children and also protect them from high rates of intergroup violence.
In these situations, it seems, fathers are so important, kids benefit from having more than one. Read more about it in this blog post of mine.
Anthropologist Barry Hewlett has devoted his career to studying
childhood and fatherhood. He discusses partible paternity--and many
other topics concerning the evolution of fatherhood--in "Fathers in forager, farmer, and pastoral cultures," a chapter appearing in the multidisciplinary academic anthology, The Role of the Father in Child Development, 4th edition (2004).
I also highly recommend Hewlett’s excellent review of the anthropology of father involvement,"Culture, history and sex: Anthropological perspectives on father involvement,"
which you can download by clicking here.
For a concise, well-organized overview of male parental care in nonhuman mammals and different human societies, check out Chapter 17 in Melvin Konner’s The Evolution of Childhood: Relationships, Emotion, Mind .
Like Hewlett, Konner is an expert on infancy and child care among hunter-gatherers.
And if you have a background in biology and evolution—and are seriously interested in the evolution of parenting in nonhuman animals—Clutton-Brock’s 1991 textbook, The Evolution of Parental Care still rates as an essential, comprehensive introduction to the literature.
References: The evolution of fatherhood
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Buchan JC, Alberts SC, Silk JB, and Altmann J. 2003. True
paternal care in a multi-male primate society. Nature. 425(6954):179-81.
Fietz J and Dausmann KH. 2003. Costs and potential benefits of
parental care in the nocturnal fat-tailed dwarf lemur (Cheirogaleus
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Gettler LT, McKenna JJ, McDade TW, Agustin SS, and Kuzawa CW.
2012. Does Cosleeping Contribute to Lower Testosterone Levels in
Fathers? Evidence from the Philippines. PLoS ONE 7 (9): e41559 DOI:
Gettler LT, Feranil AB, McDade TW, and Kuzawa CW. 2011.
Longitudinal evidence that fatherhood decreases testosterone in human
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Hartung J. 1985. Matrilineal inheritance: New theory and analysis. Behavioral and Brain Sciences 8:661-688.
Hewlett BS 2000. Culture, history and sex: Anthrpological
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Malcolm JR. 1985. Paternal care in canids. American Zoologist 25(3):853-856.
Marlowe, F.W. 2005. Who tends Hadza children? In: B. Hewlett and
M. Lamb (eds), Hunter-Gatherer Childhoods: Evolutionary, Developmental
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Schradin C, Reeder DM, Mendoza SP, and Anzenberger G. 2003.
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new world monkeys (Callicebus cupreus, Callithrix jacchus, and Callimico
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Schradin C. and Anzenberger G. 1999. Prolactin, the Hormone of Paternity
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Sear R and Mace R. 2008. Who keeps children alive? A review of
the effects of kin on child survival. Evolution and Human Behavior
Wolf LE, Ketterson ED, and Nolan V Jr. 1988. Paternal influence
on growth and survival of dark-eyed junco young: Do parental males
benefit? Animal Behaviour 36: 1601-1618.
Vasey N. 2007. The breeding system of wild red ruffed lemurs (Varecia rubra): a preliminary report. Primates 48: 41–54.
Content last modified 6/13