DANVILLE, Pa – A couple who took their nearly 5-foot boa constrictor for a swim in a Pennsylvania river say the pet slipped away and they're concerned about its welfare. The Bloomsburg Press Enterprise reported Thursday that Kolby and Zachary Latranyi had been swimming with the snake named Leyla last weekend in the Susquehanna River. The Latranyis say the red-tailed boa was shedding, so the swim was designed to help it remove material from its scales.