The aquatic birds on 16 wetlands in Torres del Paine National Park, Chile, were surveyed monthly from July 1985 to June 1988. Seasonal patterns varied for each species, but average monthly numbers increased from 464 in August to a high of 911 in January, with migration from the park occurring from March to May. Average December density and diversity had significant negative linear regression relationships with pond or lake size. Absolute numbers were not related to size of wetland area. The Upland Goose (Chloephaga picta) and the Redgartered Coot (Fulica armillata) were the most abundant species and the ones found on the greates number of ponds and lakes.