This photo is taken in Washington, DC zoo.
According to the article in Wikipedia, They eat mostly bamboo, and may eat small mammals, birds, eggs, blossoms, and berries. In captivity, they were observed to eat birds, blossoms, acer and morus leaves, bark and the fruits of acer, beech and morus.
Like the Giant Panda, they cannot digest cellulose, so they must consume a large volume of bamboo to survive. Their diet consists of about two-thirds bamboo, but they also eat mushrooms, roots, acorns, lichen, and grasses. Occasionally, they supplement their diet with fish and insects.