ea982cb8__Reference___Tech_Center___NPR__FIELD_DESCRIPTION
[FIELD NAME] thumbnail [SUB-ELEMENTS AND PARAMETERS] No parameters at this level. thumbnail does contain sub-elements called "medium" and "large". [FIELD DESCRIPTION] 
The image URL for a small representative image for the returned story. This image is designed to entice readers to view the story.
API Output Reference : Tech Center : NPR
FIELD DESCRIPTION