For mountaintop lookouts, dress for weather 15 or 20 degrees colder than valley forecasts. Always take wind chills into account. Including thermos of hot beverage. To cushion rocks. Tripod or gunstock mount.
Pens fail to work at low temperatures.
In warm weather. Wings held in shallow dihedral. Also very falcon-like in shape, but more casual and buoyant in the air than larger falcons. Light secondaries create pale line along trailing edge of wings on adults. Head appears to stick as far forward as tail does behind.