Although no organized tours are offered, ardent birders have the opportunity to spy 170 different species in Aruba. In early winter, migratory birds swell the number to about 300. In the High-Rise area, the Bubali Bird Sanctuary's ponds and wetlands attract more than 80 species, including brown pelicans, black olivaceous cormorants, herons, and egrets. Arikok National Park, which makes up much of the island's north-central region, is home to hummingbirds (common emerald and ruby-topaz), rufous-collared sparrows, ospreys, yellow orioles, American kestrels, black-faced grassquits, yellow warblers, Caribbean parakeets, long-tongued bats, common ground doves, troupials, crested caracaras, and Aruban burrowing owls.