Moonbird (1959)

A young boy and his baby brother find their bird has escaped and so in the middle of the night, the take their bag of bait into the garden where they hope to lure it back into it's cage. The snag is that the younger sibling is a bit noisy. He speaks loudly. He cries loudly. He walks loudly. He is to stealth what Herod was to childcare. Speaking of that gentleman, I did find the extremely accurate imitation of the baby speech - especially the eye-watering rendition of "I've Been Working on the Railroad" did get under my fingernails to the point where I'd have readily summoned one of his soldiers. The animation, though, is creative using the darkness and shade as well as a ghostly style to represent the two children quite effectively as the colourful, ostrich style (and size), bird arrives on the scene and the bairn has to try to be quiet. Well good luck with that! The last scene is quite funny, but...