Founded in 1889, the Smithsonian's National Zoo and Conservation Biology Institute sits on 163 acres in the heart of Washington, D.C.'s Rock Creek Park and is home to more than 2,100 animals representing almost 400 different species.
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The Zoo was designated as a National Historic Landmark in 1987 due to its significant architecture featured in the Elephant House, the Reptile House, and the Passenger Pigeon Memorial. The Zoo's Reptile House is the oldest existing Zoo building in the country, dating from 1875.
Costs of animal feed, building products, fuel and other overhead continues to rise, he said, and the zoo recently increased its minimum wage for employees $2 to $13 per hour.
Zoos can help to save endangered species by keeping them in a 'safe' environment. Safe as in protected from poachers, predators, habitat loss and even starvation. If a zoo has a breeding programme, this is another way to protect endangered species which may have trouble finding suitable mates in the wild.
It is well known for its lush, naturalistic habitats and unique animal encounters and is home to more than 3,700 rare and endangered animals representing approximately 660 species and subspecies and a prominent botanical collection with more than 700,000 plants.
Schönbrunn Zoo (German: Tiergarten Schönbrunn; also simply called Vienna Zoo) is a 17-hectare (42-acre) zoo in the city of Vienna, Austria. Established in 1752, it is the world's oldest zoo still in operation.