Smithsonian National Zoo is a zoo located in Washington, D.C., the United States. It is the oldest zoo in the United States and is part of the Smithsonian Institution. Admission is free.

The zoo is home to over 2,000 animals representing over 2,800 species. Some of the most popular animals include giant pandas, giraffes, elephants, tigers, lions, and chimpanzees.

The zoo is divided into 18 zones, each of which showcases animals from a particular region. The Asia Trail features animals from Asia, the American Trail features animals from North America, and the African Trail features animals from Africa.

The zoo is committed to animal welfare and conservation. It has created exhibits that replicate animals' natural habitats and conducts research to prevent and treat animal diseases.

Smithsonian National Zoo is a popular tourist destination for visitors to Washington, D.C. It is a great place to see a variety of animals and learn about the importance of nature.

Here are some additional details about the zoo:

* The zoo was founded in 1828 by an act of Congress.
* It is the largest zoo in the United States by area.
* The zoo is home to the only giant panda breeding program in the United States.
* The zoo has a variety of educational programs and events for visitors of all ages.