The National Zoo in Washington, D.C., announced Monday that one of its Asian elephants is pregnant and will deliver the zoo's first calf in 25 years.

The National Zoo in Washington, D.C., announced Monday that one of its Asian elephants is pregnant and will deliver the zoo's first calf in 25 years.

Animal care staff at the National Zoo are preparing for the \

Zoo staffers are "cautiously optimistic" that Nhi Linh will deliver a healthy calf early next year.