The third degree of Freemasonry and the rigorous procedures to advance to that level. The term may have been coined by nineteenth century New York City Police detective Thomas F. Byrnes, perhaps as a pun on his name, as in third degree burns. The Knights of Columbus have a third degree ceremony which is required to advance to that level, seen as rigorous.
The bugle developed from early musical or communication instruments made of animal horns, with the word bugle itself coming from buculus, Latin for bullock (castrated bull).
Vertebrates aren't the only group of animals that have hearing. Some insects have hearing organs as well (e.g. the long-horned grasshopper, lubber grasshopper and the cicada); they use sound as a form of communication. Something widely spread among insects is body hair, that can be made to swing by sonar waves.