Other areas are surveyed as time and money allow. In Anchorage these survey areas include Eagle River, Bird Creek, Glacier Creek, and Kincaid Park. It is possible to determine trends in annual fluctuations in the Anchorage moose population. Dall sheep and mountain goats. Dall sheep and mountain goat populations are estimated by aerial counts.
Goats are more scattered than sheep and tend to inhabit more broken terrain.
They also spend the warmer midday on snowfields or in shrub habitat and tend to hide from planes by flattening against cliff faces or under overhangs. Therefore, they are more difficult to see than sheep. Dall sheep surveys are flown every summer in the Anchorage area, if the weather permits. The flight pattern follows elevation contours above treeline. Because almost all the sheep are presumably seen, the total count usually serves as the population estimate.