MONG LA, Myanmar — “It’s delicious,” the Chinese waitress says, pointing at the three metal cages on the pavement. Inside each is a ball about the size of a melon, covered in crocodile-like scales. Sensing danger, the three pangolins have instinctively curled themselves into tight balls. In the wild, this reflex gives them ample protection from predators like bears and large cats. But there’s little defense against wildlife traffickers and well-heeled diners hoping to taste a rare and exotic meat.