Source of book: Borrowed from the library
Before I jump into the book, I wanted to say a bit about the author’s name. When my wife saw me reading it, since the title is partly obscured by the library bar code, she noted the name and asked if it was by some religious sort.
The answer is no - Menno Schilthuizen is not obviously religious - he is a Dutch ecologist and writer.
The name “Menno,” while common enough as a Dutch name, also gave a name to a significant Anabaptist movement during the Protestant Reformation. Dutch pastor Menno Simons is credited with founding the movement that would later be named after him: the Mennonites.
My family on both sides was once Mennonite: my dad’s mother, and my mom’s father were both the children of German Mennonites who fled Germany first to Russia, and then to the United States, due to persecution from the state over their refusal to serve in the military.
By my grandparents’ generation, my ancestors had left the Mennonites and joined the Christian and Missionary Alliance denomination, and had become pretty normal American Evangelicals.
Mennonites these days are a very broad group, from the mainstream Mennonite Brethren denomination which is indistinguishable from hundreds of other conservative Protestant groups, to the Amish and other Luddite-leaning groups.
So anyway, about the book.
The author is an ecologist, but specifically an urban ecologist. He studies organisms that live in cities - the organisms that didn’t build the cities, but have come to live there.
Part of this study is the study of how organisms evolved and are evolving. Because cities do in fact drive evolution - often rapid evolution - as the result of the new niches, challenges, and opportunities that cities provide.
Despite modern cities only being around for a couple hundred years, organisms have already shown significant evolution.
As the book explores, there are differences in changes that do have to be teased out, and how that is done is part of the fun of this book. For example, is a change just a change in behavior? Did the organism learn a different behavior? Or is that now encoded in the genes?
One of the ways this can be tested is to remove individuals from the city and countryside at or before birth, and test how they behave in specific ways. If both behave the same, it is just a behavior. If the behaviors diverge, despite no change to learn it, then it is genetic.
To try to explain all of this in detail is beyond the scope of this post, because the author is able to put a tremendous amount and range of information into the book. It is easy to understand, yet fairly in depth - a nice balance. The author looks at everything from fungi and archaea to plants and animals. And how all of them are connected.
I should also mention that, although the author is Dutch, the book is written in English, not translated. He clearly is multilingual, as the writing is excellent.
I’ll just mention a few of the things he looks at, and share some of my favorite quotes.
To start the book, he looks at the mosquitoes that live in the London Tube. Did you know there were any? Neither did I - but they will probably find me tasty if I visit London again. (And apparently during the Blitz, they plagued those seeking shelter in the tunnels.) These mosquitoes have already evolved noticeable differences both from above-ground mosquitoes and between the residents of different subway lines. These differences can be seen in the DNA, not just in the mating behaviors. It’s pretty wild.
First, we have been taught that evolution is a slow process, imperceptibly whittling species over millions of years - not something that could take place within the short timespan of human urban history. It drives home the fact that evolution is not only the stuff of dinosaurs and geological epochs. It can actually be observed here and now!
In one of the chapters on various birds that have become so inseparable from human habitation that they are no longer found in the wild, the author also notes that certain species are “pre-adapted” to urban life. He notes House Sparrows and Pigeons (aka Rock Pigeons) that found urban areas to contain the same basic elements of their seemingly different natural habitats.
Speaking of birds, I did not know the story behind how Starlings came to the Americas. They are a European native, common enough, and even mentioned in Shakespeare (Henry IV Part 1).
And that is the problem. Eugene Schieffelin was part of a group that sought to “improve” North America by importing foreign species - and his particular way of doing that was to import and release every bird mentioned in Shakespeare. And thus we have starlings. In fact, about as many starlings as people.
I also found the mention of Cliff Swallows to be interesting. This is an example where evolution has definitely happened just in the last 50 or fewer years. Here in my part of California, their nests are under any overpass that is near enough to a source of wet dirt - aka mud. Many of these overpasses have cars that whiz along underneath them, which is a definite hazard.
To cope with this, swallow wings have evolved to be shorter, letting them turn faster and take off more quickly. Since the 1980s, when the swallows seem to have discovered the new nesting opportunities, wing lengths have shortened by an aerodynamically significant amount, while deaths from car strikes have declined by an astonishing 90 percent.
And this wasn’t even the shortest evolutionary period that the author mentions. In a study on Anole lizards, importation to a new habitat led to significant changes in only 10 years.
While adapting to human hazards such as vehicles can be done in part by behavioral changes as well as evolution, others are only possible by evolution. One example in the book is that of Monkey Flowers growing around California’s Copperopolis Mine. (Which is also the name of an excellent album by Grant Lee Buffalo…)
The flowers have had to adapt to the high concentrations of copper and other toxins. And they have - a mutant gene is found in the flowers growing in the area that allows them to purge the copper. Similar genes have been found in other organisms from grasses to pigeons allowing purging or tolerance of other toxins.
I have mentioned elsewhere once my dad was an “old earth” Christian, and generally believed in science. (At least back in the day - now, he is a climate denialist and anti-vaxxer and Covid conspiracy theorist. Sigh.) But we were drenched in the Young Earth Creationist view from church and school curriculum, which denied the reality of an old earth and biological evolution. I rejected all that soon after I became an adult, but have continued to follow what is going on in that world.
And it is….weird. Really weird.
In many ways, YEC has kind of embraced evolution, but insisted that it all had to occur during the immediate aftermath of the Flood, and…well, not it doesn’t make any sense. If you want to go down that rabbit hole, I recommend Naturalis Historia for deep dives into all kinds of stuff related to natural history and YEC silliness.
There is a line in this book that I think really encapsulates the ongoing issues with YEC, and why I can’t even discuss science with right wingers. (Those two are connected.)
In other words, Hunter the creationist made a distinction between soft selection, which he saw as an inevitable physical process, building on already existing materials, and the origin of something entirely new, new genes and new “kinds of organisms.” Only the latter, in Hunter’s opinion, deserves to be called evolution (and, needless to say, to his mind cannot exist.)
It’s amusing to see how creationism, in the face of ever-improving evolutionary knowledge, keeps moving the goalposts about what counts as evolution. Fortunately, this is not a matter of opinion.
Science doesn’t care what you believe. Reality doesn’t care what you believe. And those who deny evolution will not be exempt from it. (A bit more on that later.)
Birds are mentioned a lot in this book. I think one reason is that birds are fairly intelligent but also reproduce quickly, making them excellent for studying evolution versus learning.
I have to mention the incident of the Carrion Crows in Sendai. They have both learned behaviors AND evolved. The behavior is that they learned that cars can be used as giant nutcrackers for walnuts, which are too hard for crows to crack with their beaks. Originally, said crows dropped the nuts from high heights. But then they discovered that slow-moving cars were less work. You can watch them at work here.
But there also appears to be a genetic element, an evolution caused by the pressures of natural selection.
One of the most interesting passages concerns which species - and individuals within that species - are best able to adapt to urban environments. I think it holds a lesson for humans as well. Despite the wet dream of the right wing, it is unlikely that we will go back to an un-globalized world. Future humans are unlikely to be able to live in small enclaves of people closely related to them, and never depend on people outside their tribe. That boat sailed (literally) thousands of years ago, and the world has continued to shrink.
And also, to urbanize. The two go together. A greater diversity and more people living close together. Adapting to this requires certain traits, none of which are characteristics of right wingers.
This discussion is part of a story about finches and the way that urban finches solve complex problems far faster than rural finches. The author sees three traits that lead to success in urban environments: tolerance (of humans), neophillia (openness to new and unfamiliar objects and situations), and problem-solving skills.
I think these apply very much to humans, which evolve on two levels. First is the biological level - and there is evidence that humans have evolved over the course of time (among other things, tolerance for lactose and ethanol…) Second is cultural evolution. Culture is a response to environment - as Maslow said, it is a way that humans work together to lessen physiological emergencies. As environments change - including urbanization and globalization - human culture adapts. So called “multiculturalism” is nothing more than an adaptation to a new reality.
As a result, those humans who are better adapted to a global world, a more urban world, have the same traits as the other organisms suited to adapt.
Tolerance of difference.
Openness to new experiences.
An ability to solve problems.
In contrast, the current temper tantrum by maladapted right wingers is based on intolerance, closed-mindedness, and a belief that only violence can solve problems. This is not likely to be a successful long-term strategy. Heck, in the short term, it has already damaged the US economy, world influence, and credibility in global human society.
Moving on, I found another story to be fascinating: the residence of Dark-Eyed Juncos in San Diego. I am used to seeing them in forests throughout the western US - they come in multiple subspecies. Here too, there is actual evidence of evolution at work. In the wild, the patches of white on the tail are used to attract mates.
In the city, however, the white makes the birds more visible to hawks, who have clearer lines of flight than in a forest. So, the white feathers are drabber and smaller on urban birds.
(Fun note here: I live in the exburbs, and get a lot of birds in my yard. Including hawks. Recently, there was the annual spring fight between the scrub jays and a Cooper’s Hawk over nesting spots in our ash tree. I have also seen Kestrels, Red Tails, and Red-Shouldered Hawks regularly. What was most surprising is that during winters, we seem to have Northern Harriers in the neighborhood, flying super low. If you want to check out my birding page, here it is.)
Another bit I thought was fun was the author’s use of an unfamiliar word: “unfankle.” Apparently it comes from the Scots, and means to untangle. So, the author wanted to untangle his mind by going for a walk.
In doing so, he ran across a bunch of invasive city plants that were originally intentionally introduced. Many of these either are or have been in the yards of places I have lived.
Wisteria, Hydrangea, Ivy, Privet (achoo!) for example. None of these are native to the US - they came from Japan.
The final passage I want to note is the one on human evolution, perhaps driven by urbanization. Within recorded history, we have indeed seen evolution in humans in a number of areas, from height to nicotine craving.
The author also speculates that there will be further changes seen as we become more able to look at the human genome itself.
One particular question has to do with sexuality. And he doesn’t mean sexual orientation (which hasn’t changed perceptibly over human history), but sexual selection.
It used to be that humans might only meet a handful of potential partners over their lifetimes. But with urbanization, most of us are in constant contact with hundreds of theoretically possible mates. Even before the internet expanded this even more, we had already seen the problem of choice overload as one of the causes of delayed marriage and parenthood.
But humans evolve too, and this will find new expressions both in culture (which we are already seeing) and eventually in biology.
A further question - one that is causing huge problems for males in right wing culture - is what will be considered desirable in a mate. Already, for humans, simply being big and strong hasn’t been the definition of desirable. Humans are social creatures, and functioning well socially and having the intelligence to solve problems have long competed with physical beauty to define desirability.
In a further urbanized and globalized world, what traits will attract mates? There is increasing evidence that right-wing toxic masculinity is not selling well with the female humans. Perhaps instead, what is needed are those three traits listed above: tolerance of others, openness to new situations, and the ability to solve problems creatively.
Or, maybe one could go all the way back to Darwin himself: an organism’s ability to survive and reproduce over time depends on its ability to adapt. You either adapt, or you go extinct.
The lesson of urban evolution is that nature finds a way. Not every species will, and certainly not every individual organism. But where there is a niche, nature will fill it. As humans, then, we must either adapt, or as a species we will go extinct. As individuals, our ability to adapt our behaviors and culture to our environment will go a long way toward determining whether we will be the kind of species that will survive and thrive, or not.