Birds are dying in record numbers this autumn by flying full-speed into Big Apple buildings, lured to their deaths by glassy skyscrapers — with the sleek Battery Park City corridor among the city’s biggest death traps. There are almost 1,000 known cases of migratory birds obliviously smashing headfirst into the mirage-like reflective buildings since August — a whopping 53% increase from last year’s strike toll. But experts warn the vast majority of bird strikes go uncounted — as unusually high winds and low clouds this year had the migrating flocks flying faster and at lower altitudes than normal. “Fall of...