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BROOKFIELD, Ill. - Thursday was National Watermelon Day!
It's a holiday that had the animals at Brookfield Zoo very excited.
Gorillas, tortoises, hippos and rhinos all took part in celebrating and enjoyed some special watermelon treats from keepers.
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The zoo's sloth bears even got whole watermelons to crush and enjoy.
Zoo staff said that watermelon is a very popular treat for the animals.