In the course of the Thirty Years' War, the ponds in Bohemia and Moravia were badly damaged and some of them were never renovated. In the 18th century, the majority of the water reservoirs were drained off. The four Tovačov ponds, the Hradecký Pond (154 ha), Kolečko (5.6 ha), Křenovský Pond (16 ha) and Náklo (6 ha), were gradually renovated after World War II. Here you can see various orders of birds - Anseriformes, Ciconiiformes, Shorebirds, Falconiformes or perching birds.