Why nothing stays the same - the personal reflection of the great naturalist Josef H. Reichholf. Birds that plunge into waterfalls, ants that create underground mushroom gardens, jaguars that originally lived in Italy and the Balkans before migrating to North and South America. Few have observed as many animals - both rare and widespread - as the great naturalist and renowned author Josef H. Reichholf. Based on the diversity of his experiences and research, he developed his highly debated theses on ecology, evolution, and conservation. After half a century, he looks back and takes stock: In nature, there is no best or only right state; stability means stagnation and leads to decline. Life is constant change; nothing stays as it is.