African Springbok Horn Coyote Howler. Collector quality springbok horn from Africa. Custom howler from master predator call builder Rick Robbins. The grooves in the horn are really unique and impart an excellent sound and tonal quality to the howler. It’s extremely easy to use and master. Create all coyote, pup and prey distress vocalizations. Call lengths vary from 6 –10 inches. No two exactly alike. Makes a great gift—Very unique and rare!