The ancient stone fortress of Carcassonne in France has transformed into a sanctuary for avocets, flamingos and other birds.

Nesting falcons, mating toads and other wildlife take over the 500-year-old Heidelberg Castle in Germany.

Animals in Germany's Neuschwanstein castle and the surrounding forests.

Iberian frogs, white-bellied hedgehogs and other wild creatures reside in Southern Spain's Alhambra palace.

Brown bears and aquatic salamanders find sanctuary in Slovenia's Predjama Castle and its eerie caves.

Not all animals are meant to be domesticated and kept as household pets. Many wild animals, by definition, are rough and rowdy, often leading to out-of-bounds behavior or savage instincts run amok. This series showcases jaw-dropping moments captured by cameras, including attacks on people and other animals, "believe it or not" encounters, and animals that portray human traits. Heroic acts of bravery, narrow escapes and unpredictable incidents are also featured in the hourlong episodes.