Instead of invoking biodiversity in passing, it is about entering the heterogeneous multiplicity of the living, descending into the intertwined game of behaviors and distances through which the animal world unceasingly unfolds. And perhaps to find there the entire and admirable conjugation of the verb to be: perhaps, in effect, it is only there, behind the animals, that this infinite detaches itself from all poses, thus releasing an innumerable decline of ways of living and even of thinking: to be a pike, to be a wildebeest, to be a cat, to be a monkey... there is a clue, or rather clues, paths that can only be followed in thought - and that is what is attempted in this book, simply starting from a route and of an animal that arises in the night.