"Turtles can be a major hazard on the runway, and they've been responsible for many a delayed flight. Diamondback terrapins crawl into JFK from nearby Jamaica Bay Wildlife Refuge, but they didn't start causing major problems until a few years ago. Airport has since removed hundreds of the turtles and laid down miles of black tubing under the airport's perimeter fence. Russell Burke of Hofstra University has been working with Port Authority's chief wildlife biologist Laura Francoeur to study the turtle problem since it started. (Yes, airports often have wildlife biologists, but they're usually most occupied with birds.) Their work involves making casts of the shells of turtles they find in JFK. Turtles shells have rings like trees that give away their age. That's when Burke noticed a pattern: the turtles were mostly seven to nine years old. Did something happen seven to nine years ago?" - Jessie

"Indeed, in 2008, an outbreak of distemper killed many of the raccoons in the safe wildlife refuge. Raccoons are voracious eaters of turtles—they usually wipe out 95 percent of newborn turtle hatchlings. Without raccoons, hypothesizes Burke, the lucky turtles survived to spill out into the airport. An unlucky few, however, have been hit by airplanes instead. " - Jessie

IT'S ALWAYS RACCOONS. - Jessie