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It hosts the Museo di Scienze Naturali with the Priolo Ornithological Collection which consists of 2250 specimens of Italian and exotic birds and butterflies.
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Ex convento dei Frati Minori Conventuali
It's the largest one in the town. It was established in the 14th century and rebuilt in 1585. It houses works by Antonello and Giacomo Gagini, and in the right nave a triptych by Messinese painters.