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Neanderthal mother with Neanderthal-Human children (Image Credit: Harvard Magazine) |
This post is
a follow up to a previous post about Neanderthal-Human
relations. Since the discovery of
Neanderthal DNA in modern human DNA there have been additional studies
regarding the interactions and sexual relations between Neanderthals and humans. A common question that my students
consistently ask is where are the Neanderthal-human babies that were fathered
by human males and birthed from Neanderthal females? This post will address this question by
explaining their existence and eventual extinction.
The
discovery of Neanderthal DNA in modern human DNA led scholars to conclude that
this was due the sexual relations between Neanderthal males and human females,
which has been substantiated through subsequent paleoanthropological
discoveries. But little attention was
initially paid to whether or not Neanderthal women and human males also bred,
producing similar but different Neanderthal-human hybrids. This is partially due to the preservation
bias against immature bones, which is due to the fragile nature of these
remains. This makes it difficult to
discover children in the archaeological record, and it is far more problematic in
the paleoanthropological record. Furthermore, due to some genetic differences between the two species it is not believed that many viable offspring existed, adding to the difficulty in discovering these individuals. Despite
this a Neanderthal-human hybrid born of a Neanderthal mother and fathered by a
human father was found at the site of Mezzena in northern Italy. This individual dates to approximately 40,000
to 30,000 years ago.
It is
believed that this individual would have been raised with its (Neanderthal)
mother, which makes sense as breast feeding is the most common means of
sustaining a young child and therefore decreases the likelihood of ripping the
child from its mother to be raised in its father’s (human) household. Additional evidence suggests that while
Neanderthals and humans may have interbred and coexisted they were not commonly
cohabitating in the same households or communities. The key piece of evidence is the different
stone tool traditions that while similar are also distinctly different between Neanderthals
(who practiced the Mousterian and Chatelperronian stone tool traditions) and
humans (who utilized the Aurignacian stone tool tradition). Furthermore, while it is clear that both
groups were practicing intentional burials they are very rarely found interred
together, and when this occurs it is typically a solitary human female with her
Neanderthal offspring and mate.
The
voluntary separation of Neanderthals and humans would have separated the
Neanderthal-human hybrid offspring by mother, which is what eventually led to
the extinction of the hybrids with Neanderthal mothers. Neanderthals died off for unknown reasons,
although it is believed that humans may have played a role in their demise. Whatever the case may be these offspring
would have become extinct as their Neanderthal caregivers died, hence why they
do not exist among modern humans today.
So there you
have it. Neanderthal-human hybrid offspring
did exist in the past. Only those born
of human mother would have been able and/or allowed to survive, which is why we
do not see them existing in our modern populations.
Bibliography
Feltman,
R. 2015.
Neanderthal Hybrid Suggests Modern Humans Bred with Them Much Later
Than Thought. The Washington
Post. https://www.washingtonpost.com/news/speaking-of-science/wp/2015/06/22/neanderthal-hybrid-suggests-modern-humans-bred-with-them-much-later-than-thought/
Gibbons,
A. 2016.
Modern Human Females and Male Neandertals Had Trouble Making
Babies. Here’s why. Science. http://www.sciencemag.org/news/2016/04/modern-human-females-and-male-neandertals-had-trouble-making-babies-here-s-why
Holloway,
A. 2013.
The Controversial Lapedo Child-A Neanderthal/Human Hybrid. Ancient-Origins. http://www.ancient-origins.net/human-origins-science/controversial-lapedo-child-neanderthal-human-hybrid-00903
Letzter,
R. 2016.
Here’s Why Human Women Probably Struggled to Have Babies with
Neanderthal Men. Business Insider. http://www.businessinsider.com/why-human-neanderthal-babies-were-rare-2016-6
Viegas,
J. 2013.
First Love Child of Human, Neanderthal Found. Discovery News. http://www.livescience.com/28270-neanderthal-skeleton-provides-evidence-of-interbreeding-with-humans.html?li_source=LI&li_medium=most-popular
Viegas,
J. 2015.
First Neanderthal-Human ‘Love Child’ from Israel. Seeker.
http://www.seeker.com/first-neanderthal-human-love-child-from-israel-1769467646.html