The endemism of the inland water fish of Greece is among the highest in Europe, reaching 66%. Small or larger fish, isolated in streams, ponds, channels, lakes and rivers have survived, against drainage, pollution, invasion of alien species and many other anthropogenic interventions. One of the most iconic of these fish is the small (4,5 cm) Greek ninespine stickleback (Pungitius hellenicus). A narrow endemic species that lives exclusively in a area of four square kilometer, in the lower reaches of Spercheios river. It is found in habitats with clean waters, calm flow and rich vegetation. They like to hide in the plants where they find various small invertebrates to feed on. The male of the species builds a nest, in late spring, where the female lays her eggs, which then the male oversees. The Greek ninespine stickleback is a critically endangered species (CR) according to the Red Book of Endangered Animals of Greece, as its populations are threatened by the alteration and loss of its habitats. Usually our awareness is limited to bears, wolves, mediterranean seals and other big and beautiful mammals. But right under our feet, in an indifferent pool there is a huge wealth of wildlife that deserves our greatest concern, as all those small animals are protagonists of survival who prove that all nature needs to surprise us is to provide the minimum space.