Interactive map courtesy of the FracTracker Alliance Five years ago, after the BP Deepwater Horizon oil spill devastated ecosystems in the Gulf of Mexico, the Obama administration slapped a six-month moratorium on deepwater drilling in the Gulf. But the fossil fuels industry has since bounced back in the region, with companies like BP building new offshore oil and gas platforms—also known as rigs—that are bigger than ever. There are currently 2,674 platforms in the Gulf, says Karen Edelstein from the FracTracker Alliance, a watchdog organization that collects and publishes data about the global oil and gas industry. The structures form a steel barrier along the coasts of Mississippi, Louisiana, and Texas; every spring and fall, millions of birds migrate over, around, and through this industrial swathe as they travel between their wintering and breeding grounds. In the BP disaster’s immediate aftermath, the spill’s effects on birds were horrifically clear. Now, five years...