My kids gave me many years ago a nice present Alfred Hitchcock's movie collection. Last night I watch the thrilling movie The Birds. for sure I watch that movie several times, but I never paid too much attention to the song the pupils were singing, do you?
But in these days using google's aid I checked for the lyrics and I wonder why Hitchcock use that unknown song for that scene?

Crows on the Playground.

This is the song sung by the school children in Alfred Hitchcock’s “The Birds.” This version is based on how the song sounds in the actual film. source thank you so much Bruce Christopher.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        now, now, now..

I married my wife in the month of June.
Ristle-tee, rostle-tee, now, now, now!

I brought her home by the light of the moon.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She combed her hair but once a year.
Ristle-tee, rostle-tee, now, now, now.
With every stroke she shed a tear.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        rusty-quo-quality, ristle-tee, rostle-tee,
        now, now, now.

He brought her home by the light of the moon.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She combed her hair but once a year.
Ristle-tee, rostle-tee, now, now, now.
With every stroke she shed a tear.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She swept up her floor but once a year.
Ristle-tee, rostle-tee, now, now, now.
She said that brooms were much too dear.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She churned the butter in her Dad’s old boot.
Ristle-tee, rostle-tee, now, now, now.
And for a dash she used her foot.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

The butter it came out a grizzle-y grey.
Ristle-tee, rostle-tee, now, now, now.
The cheese it took legs and ran away.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She let the critter get away.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

I asked my wife to wash the floor.
Ristle-tee, rostle-tee, now, now, now.
She gave me my hat and she showed me the door.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        now, now, now.

I married my wife in the month of June.
Ristle-tee, rostle-tee, now, now, now!

I brought her home by the light of the moon.

        Ristle-tee, rostle-tee, hey donnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.

She combed her hair but once a year.

        Ristle-tee, rostle-tee, hey jonnie-dosilty,
        knickety-knackety, rusty-quo-quality,
        willoty-wallity, now, now, now.
        Ristle-tee, rostle-tee, now, now, now.
---------------------------------------------------

The following version is taken directly from the script dated
Feb. 15, 1963:

I married my wife in the month of June.
Ristle-tee, rostle-tee, mo, mo, mo!

I brought her home by the light of the moon.

        Ristle-tee, rostle-tee, hey bombosity,
        knickety-knackety, retro-quo-quality,
        willoby-wallaby, mo, mo, mo.

She combed her hair but once a year.
Ristle-tee, rostle-tee, mo, mo, mo.
With every stroke she shed a tear.

Ristle-tee, rostle-tee, hey donnie-dosilty,
rusty-quo-quality, ristle-tee, rostle-tee, mo, mo, mo.

Brought her home by the light of the moon.