Brittle stars, animals with five-segment radial (pentaradial) symmetry, lived millions of years ago in the territory of present-day Poland. They survived, although today they can only be found in high salinity waters. Fossil species of these agile echinoderms found in Kujawy and the Krakow-Częstochowa Upland have been described by scientists from Warsaw.
Roe deer, not red deer, is the main source of food for wolves in Roztocze and the Solska Forest, according to research by Polish scientists. The domination of roe deer in the diet of these predators has persisted for two decades. The wild boar currently has the second place in wolves' menu.