But even wild animals that were bred in zoos and have never known the wild, that are perfectly adapted to their enclosures and feel no tension in the presence of humans, will have moments of excitement that push them to seek escape. All living things contain a measure of madness that moves them in strange, sometimes inexplicable ways. This madness can be saving; it is part and parcel of the ability to adapt. Without it, no species would survive. (1.10.2)