No giraffes or elephants in the scenery unless they escape from the National Zoo.
Only dinosaurs you might cross path with will be politicians and media types.
If you never travel without your camera and want to join kindred spirits for another look at the capital city, Washington Photo Safari offers a number of themes including Monuments and Memorials and with Spring approaching Cherry Blossoms.
Check the Monthly Calendar and see what options you have.
Washington Photo Safari also offers a training ground to all amateur photographers who want to enter the National Cherry Blossom Photo Contest a collaboration between Foto DC and National Cherry Blossom Festival (March 26, April 10, 2011).
For that you might take a walk around the Tidal Bassin (above).
(* Photo by Scott Bauer for USDA via Wikipedia)