The difference between Paca and Royal rat
When used as nouns, paca means any of the large rodents of the genus cuniculus (but see also cuniculus#synonyms), native to central america and south america, which have dark brown or black fur, a white or yellowish underbelly and rows of white spots along the sides, whereas royal rat means paca.
check bellow for the other definitions of Paca and Royal rat
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Paca as a noun:
Any of the large rodents of the genus Cuniculus (but see also Cuniculus#Synonyms), native to Central America and South America, which have dark brown or black fur, a white or yellowish underbelly and rows of white spots along the sides.
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Royal rat as a noun:
paca