Pig Whistles in the Tundra

Pig Whistles are popular among my female fans. They're plant eaters who live in the tundra. Their outer lungs are connected to their proboscis, and when air passes quickly through it, it creates a high pitched sound like what New Years Whistles do. This is made to scare off predators. Their hooves are strange and shaped like domes, as if they're walking on high heels.