The Vistula Valley is a place of living and the path of animal migration. The Vistula Valley is a habitat and migration route for many species of animals, especially birds. You can often see the common goldeneye, cherries, gulls, gray herons, black storks, kanie rude, kingfishers, gray nightingales, faithful swans, white-tailed eagles, hairy buzzards. To especially protect rich ecosystems, in the park was created 14 nature reserves. Among them, noteworthy are:. forest reserves: “Big Paddle” with bright oak and mixed forests and "Grabowiec” with a slope forest, protected species of herbaceous plants and oaks with a circumference of 5-8 m. In "Wielka Kępa Ostromecka” and the "Marian Forest” fragments of old riparian forests with poplar have survived, oak, elm, ash and alder.