Black Kites are the raptors of the sky just like eagles, hawks and the like. They can be found in Europe and Asia are excellent aerial acrobats. Sometimes they can be seen grabbing onto each others feet in a 'death spiral' during fraught aerial courtships.
Research the hell out of your subject—visual references and any bit of interesting info that explains the physiology and comparatives (black kite vs human for example). After whittling down the best and most engaging parts come up with original ways to visualise the thing. Then, keep a record of all your references, bookmarks and links.