J ulian Pratt, frontman for punk-rap bruisers Show Me the Body , has a simple request: Show us the pigeons. The shaven-headed 32-year-old vocalist and banjoist is tromping through Astoria Park, a verdant stretch of Queens along New York’s East River, with his two-year-old daughter, Surey, on the hunt for the city’s most famous wildlife. But since it’s an unusually chilly Friday, at least for May, the city’s famously ample winged rats seem scarce. Luckily, Pratt came prepared. Pratt runs deep with New York’s pigeon community; picture Marlon Brando traipsing through rooftop coops in On the Waterfront, and you’ll get the idea. So he knows where to buy 20 pounds of feed, and he brought a pound or two with him. Pratt and Surey spot a couple of pigeons underneath the RFK Triborough Bridge, toss the seeds, and before long, dozens of birds are descending on them as they giggle and Surey attempts scattering maneuvers that resemble mosh-pit moves.…