From Creatures Wikia
"These maracas are an instrument for your creatures to play. Of all the toys available to inject into a world, this is definitely a top 10 favorite among all the creatures breeds. Some creatures will be totally entranced and amused for hours, even neglecting to eat while playing with the maracas.
Be careful that they don't overdo it though, maracas can be irritating to other creatures - fights have been known to break out."
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