Sixty species are year-round residents. Nearly 120 species breed in the park, including 52 species from the neo-tropics. Many other species use the park as an important stopover and foraging area during their semiannual migration. Even with over 75 years of observations, the park still adds new species too its list. In the winter of 2016/17, both the Long-eared Owl and the Ross' Goose were documented in the park for the first time. View a list of Species of Concern in the park. Changes in elevation affect the types of vegetation that grow in the mountains and determine where many birds can be found. Some species are found only in distinct habitats at certain elevations, while others may range over several habitats.