There is "nature", and there is the city. It is the largely unstated presumption, in most discussion of biology and ecology, that the two are separate, and so all of the territory which is subsumed by the latter, is lost to the former. This is, of course, not really true; lots of life passes back and forth between the city and the countryside, even the parts of the countryside with no humans living in it, and therefore the city is very much part of nature. But, a gut level aversion to how urbanization has chewed up ecosystem after ecosystem has left most biologists with a reluctance to spend a lot of attention to how the urban ecosystem works. Not so, Menno Schilthuizen. Coming from northern Europe, one of the places where urbanization has reached even higher levels than for the planet as a whole, he has begun to give serious thought (and some serious research) to how biology in the city works, and how it evolves.
There are, as is well known and frequently discussed, many plant and animal species that cannot live in a human city, and they are beleaguered. What is not as often discussed, are those species that thrive in it. Raccoons, rats, pigeons, corvids of all kinds, coyotes, and many other animals have found the abundance of food scraps (and occasionally small dogs and cats) that humans leave out undefended, to be a cornucopia of tasty and relatively nutritious morsels, free of most big predators. A greater number of plants have spread from city to city around the world, springing up between pavement stones, on piles of trash, and in the leaf litter you failed to remove from your house's gutters. Insects live on and in your trash, and especially ants carry on in their indefatigable ant ways, right across and through human habitations.
It is well known that humanity is, directly or indirectly, responsible for many species going extinct. Schilthuizen examines the controversial claim that we may also be, without realizing it, splitting many species into two, as the country- and city-versions acquire distinct ways of feeding, mating, raising their young, and even acquire different patterns of global distribution (for example, what cannot live in the cold of a northern countryside, may be able to live in the heat-island of the city). Insects that learn to be a bit less attracted to the light. Birds whose wing shapes start to evolve to be better adapted at a quick launch to get out of the way of oncoming car traffic. Raccoons and coyotes that become more social, the better to crowd around the dumpster.
One of the lost pastimes of the 19th and previous centuries, is the observation of animals and plants in their natural environment, as more and more of us live in places without a lot of "nature" that is handy to observe. What Schilthuizen wants us to notice, is that there are also plants and animals right where we live, and it is worth noticing them. How do they behave? What do they hunt, and what hunts them? How does this change through the course of the year? But, as with nearly any topic, it helps us to observe, if we have someone to give us a jumpstart, by pointing out to us much of what they have seen. Some will find this distasteful, thinking that the proper attitude to have towards urban plants and animals is only to bemoan the priceless diversity that they (and we) pushed out. Which, no doubt, they did. But if our choices (for the moment at least) are to either notice the plants and animals around us, especially the ones we didn't put there that showed up anyway, or else to not notice them, it seems worthwhile to see what is there, and appreciate it for what it is. Schilthuizen is here to tell you a little bit of what you're looking at, and how it works.