| Since then, however, several groups of investigators have employed the idea of teaching a nonvocal language to apes. |
| The music throughout is nonvocal, so there's little distraction, and is fairly generic dance-style music that most viewers should find inoffensive. |
| They're not really nontelepathic, any more than the Kierawelans, for example, are nonvocal. |
| In addition to vocal sounds, at least one cuckoo, the North American, or greater, roadrunner, makes nonvocal sounds, clacking the mandibles to produce a rattling noise. |
| Significant differences between nonvocal and vocal communication are matters more of degree than of kind. |
