"Our flying squirrel is in no proper sense a flyer. On the ground, he is more helpless than a chipmunk, because less agile. He can only sail or slide down a steep incline from the top of one tree to the foot of another."
Steep
"Our flying squirrel is in no proper sense a flyer. On the ground, he is more helpless than a chipmunk, because less agile. He can only sail or slide down a steep incline from the top of one tree to the foot of another."