Near Ayo village, about 3.2 km from the natural bridge towards Casibari (now defunct) are located the monolithic rock boulders named Ayo Rock Formations. The Arawak people, the earliest settlers on the island of Aruba, used to visit this formations and carved paintings in rocks called petroglyphs while performing religious rites. One of the unusual and notable rock formations is the Casibari Boulders, which are tonalite rocks seen to the north of Hooiberg. They are reddish brown in colour and rise above the desert landscape giving a panoramic view of the island. They are located amidst cacti, and lizards are commonly encountered here. The boulders have unusual shapes resembling birds and dragons. There is no plausible explanation yet for the presence of these unusual wind-carved boulder formations on a flat sandy island.
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