U.S. President Barack Obama, left, gestures during a joint press conference with Ethiopian prime minister Hailemariam Desalegn, at the National Palace in Addis Ababa, Ethiopia,  Monday, July 27, 2015.  (AP Photo/Sayyid Azim)

White House Notebook: Barack, meet Lucy.

ADDIS ABABA, Ethiopia (AP) — President Barack Obama met an unexpected guest on the way to Monday night’s state dinner at Ethiopia’s National…