Every year in late August, one of Portland's most spectacular natural events begins: Thousands of Vaux’s Swifts gather in the city as they prepare to migrate to Central America and Venezuela. Migrating swifts often use chimneys as roosts (places to sleep), and they are likely to return to the same roost year after year. One population has been returning to Chapman since the 1980s, and it is one of the largest known roosting sites of migrating Vaux's Swifts.
Swift watching has become a popular activity at Chapman, and on many evenings, more than 2,000 people gather to watch these aerial acrobats. More information on this wonderful event can be found here.