The Thung Nham ecotourism zone is part of the Trang An Landscape Complex, a UNESCO World Heritage site located in Ninh Hai commune in Hoa Lu district, about 100 km south of Hanoi. (Photo: VNA)

Thung Nham Birds Park houses more than 40 species of birds, some of them named in the Red List of Threatened Species by the International Union for Conservation of Nature and Natural Resources. (Photo: VNA)
The beauty of birds at Thung Nham Bird Park (Photo: VNA)

The sky is covered by white storks. (Photo: VNA)
Visitors will have a chance to discover the nature and watch rare flamingoes and white storks flying. (Photo: VNA)

The most wonderful time to visit the park is when flocks of birds appear at dawn and dusk. (Photo: VNA)

Thung Nham has a rich ecosystem, including more than 100 flora and 150 fauna species. (Photo: VNA)
The best time to visit Thung Nham is in summer and spring, when the birds are busy building nests and breeding. (Photo: VNA)

Thung Nham Birds Park is home to more than 40 species of birds. (Photo: VNA)