The creature must make a Climb check to climb any wall or slope with a DC of more than 0, but it always can choose to take 10, even if rushed or threatened while climbing. The creature climbs at the listed speed while climbing. Creatures cannot use the run action while climbing. The creature can fly at the listed speed if carrying no more than a medium load. All fly speeds include a parenthetical note indicating maneuverability, as follows.
Creatures can use the run action while flying, provided they fly in a straight line.
Most flying creatures have to slow down at least a little to make a turn, and many are limited to fairly wide turns and must maintain a minimum forward speed. Each flying creature has a maneuverability rating that defines how it moves when flying. If it is too high above the ground to land, it falls straight down, descending 150 feet in the first round of falling. If this distance brings it to the ground, it takes falling damage. If the fall doesn't bring the creature to the ground, it must spend its next turn recovering from the stall.