"The Cuca, which originally came from the Portuguese coca, a dragon legend, was brought to Brazil in colonial times. The Cuca is an ugly old woman who appears in the form of a crocodile and robs disobedient children. The Cuca only sleeps once every seven years, and parents sometimes use this element of the legend to scare children who don't want to go to sleep, telling them that the Cuca will get them if they don't go to bed." –The Legend of the Cuca

Notes

A Version from Wikipedia:

Dorme neném
Que a Cuca vem pegar
Papai foi na roça
Mamãe foi passear

Translation:

Sleep baby
Or the Cuca will catch you
Daddy went to the plantation
Mommy went out for a walk.

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Thanks and Acknowledgements

Translated by Lisa.