Opočno Castle, year-round residence of bats

The Renaissance castle near Rychnov nad Kněžnou stands on the site of an ancient hillfort, already mentioned in Kosm's Chronicle. In addition to extensive collections of weapons, paintings and books, it also hosts rare animal inhabitants from the order of airplanes all year round.
A large summer colony of big bats resides on the ground. Every year from June to August, 130-200 females of this our largest species give birth to their young. Addition…