A local news report informed me earlier this
evening that there are 23,000 wild turkeys in NJ according to the state DEP. They
mean the fowl, not the whiskey. It is not entirely clear to me who counted or
how, but I’ll take the DEP’s word for it. At least a few of the birds live in
the woods around my house. They don’t walk through my yard very often, but when
they do they do so nonchalantly without apparent concern about ending up on the
menu.
For anyone accustomed only to domestic turkeys the
wild ones, though not technically a separate species, hold some surprises
beyond the color of their feathers. For one thing they fly. They don’t fly
particularly well, and most of the time they prefer not to, but they can. They
sometimes swoop over the lawn or get up into the trees. For another thing they
are fearless. Domestic turkeys are too in a way, but one gets the sense that domestic
ones just don’t know any better. Wild turkeys are fearless out of confidence rather
than ignorance. On occasion one can be aggressive. An aggressive turkey is annoying
rather than truly dangerous, of course, except maybe to a toddler. Finally,
they are smarter than their farm-bred kinfolk.
Domestic turkeys are stupid. There is no kinder
way to say it and still deliver the facts. My grandfather, a farmer, lost some
of the birds because they looked up in the sky with their beaks open when it
was raining and drowned themselves. In their scholarly article Some Remarks on Bird's Brain and Behavior
under the Constraints of Domestication, Julia Mehlhorn and Gerd Rehkämper
remark, "domestic turkeys show the highest degree of brain reduction
measured in any of the domesticated birds so far.” No surprise there. So, while
these birds face bad odds at Thanksgiving time, if that Zombie Apocalypse
depicted in so many movies ever happens, they’ll be safe. Unless it rains.
It long has been known that domestication reduces
the brain size of animals. From the same Mehlhorn and Rehkämper article: “Empirical
data on brain sizes which show smaller brains in dogs than in wolves or in
domestic ducks in comparison to mallards seem to support this point of view.”
Before we admire too much the skills of our ancestors who successfully dumbed
down animals to make them more manageable, it’s worth noting that they did the
same to themselves. To us.
Brain size peaked in humans 20,000 years ago and
since then has dropped substantially, both as a percentage of body mass and in
absolute terms – from an average 1500 cc to 1350 cc. (Homo Erectus was 1100 cc – we’re getting there.) David Geary, a
cognitive scientist at the University of Missouri, speculates, “I think the
best explanation for the decline in our brain size is the Idiocracy theory.” He and his colleague Drew Bailey were able to
show a correlation in the archaeological record between population density and
brain size decline, whether in early farming regions such as the Middle East or
hunter-gatherer regions such as aboriginal Australia. “We saw that trend in
Europe, China, Africa, Malaysia—everywhere we looked.” The hypothesis is that
when societies grow large enough to carry the dim bulbs who would not be clever
enough to survive without a social safety net, there is no particular advantage
to large brains or high intelligence. The dim bulbs live to reproduce. There is,
on the other hand, an advantage to characteristics that suit living peacefully among
others. In other words, there is an advantage to being tame and domesticated.
Domestication, once again, shrinks the noggin. Hence the reference to the Idiocracy movie.
So long as the turkey is on our menu and not we on
its, we’re probably not in too much trouble. But if a Cro-Magnon shows up for
dinner, don’t try to beat him at chess afterward.