" Most dogs could hear four times better than a person, but Maggie’s enormous, upright ears evolved to detect quiet predators and distant prey. She could control each ear independently of the other. Eighteen muscles articulated each ear, shaping and sculpting her sail-like pinna to gather and concentrate sounds at frequencies far beyond any a human could hear. This allowed Maggie to hear seven times better than Scott. She could hear the whine of a jet at thirty thousand feet, termites chewing through wood, the crystal in Scott’s watch hum, and thousands of sounds as invisible to Scott as the scents he could not smell. When "

― Robert Crais , The Promise (Elvis Cole, #16; Joe Pike, #5; Scott James & Maggie, #2)