Optional brief synthetic tones, with a full text alternative below. These are not bird calls, research recordings, hearing tests or an experiment on embryonic learning. Begin at a comfortable device volume. Nothing plays until selected.
Silent.
| Pattern | Three pitches in order | Timing |
|---|---|---|
| A | 440, 554, 660 Hz | Each tone 150 ms; each gap 150 ms |
| B | 440, 660, 554 Hz | Same tone and gap durations |
Both contain exactly the same three pitches. Their order differs. Replay A, then B. If you prefer silence, compare the transcript. A difference in order does not by itself establish that any particular animal detects or learns it.