No, dogs don't tilt their heads when we're talking to them because they're trying to be adorable (although, that is definitely a side effect). A new study found that they may actually be doing it for visual reasons.
We always hear it, but we never see it. Cicadas fill our summer and fall afternoons and evenings with their "singing." How do they make the sound? We caught one of them on video making that very strange sound we're all so familiar with.