How does this toy water bird whistle produce sound?

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How does this produce sound ?

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What is there inside this toy? I can see a square opening on the handle.

Air flows in and out through the same opening, but at different velocities?

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I think when the air is blown into the whistle, the slotted edge (inside the whistle) divides the air into two parts, thus creates oscillating sound waves that tumble around the chamber (under the bird). When that air comes out of the small opening on the other side, then it results in an audible pitch.

Here I have a question. Does the chamber under the bird have some balls inside it? Because, considering the length of the whistle, it may result in a flat tone without any balls inside it.

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