During the winter months, the Montauk Post Office is like a watering hole in the Serengeti. Residents of all stripes approach cautiously for fear of crocodiles in the form of home-heating bills. Their junk mail becomes buffalo chips to feed the fire. They drink in gossip and news of the whereabouts of others not seen at the hole of late. They bay for summer, yet speak in fear of the herds that will descend on their place as the weather warms.