During the Cold war the Humboldt University in Berlin discovered that the city is a habitat on its own. Ecologists were locked up in their city. Where could they investigate the nature? In the city! What emerged from scarcity appeared to be a break through in the history. Since then nature is no longer referred to as “that what lives outside the city”. The city is a unique habitat came worth investigating. And so was born the profession of urban ecologist.

The city habitat is thriving! Surprisingly a big part of the growth of diversity takes place in our own house. The Science Appendix of the journal NRC this weekend writes about the animals, plants and mushrooms in our homes and offices. We appear to live in a global indoor biotope that can be found in buildings all over the world. As we take and have taken along unnoticed a wide range of animals while travelling around the world. Everywhere are the same toilet moth, pink mold and dust mites inside. I predict a new loot on the tree of ecologists, the indoor ecologist.
The animal and plant species that like to live with people are called anthropophyles. They love us and we start loving them noticing an increasing popularity of these largely invisible creatures. They are starring in renown newspapers and have their museum – Micropia in Amsterdam. A great museum that shows us what we can’t see with our humble eyes. If I had to wear glasses I’d choose microscope glasses to get to see that small beautiful stuff.