A celebrated hero confidently flies over the desert on his hippogriff. The young man is enjoying the spectacular view when suddenly a massive red worm launches itself into the air. In a split second the dunewinder swallows the rider and his mount.
Sky Watcher. These huge worms usually tunnel under the sand. However, they also look up from their holes to see what prey is flying by. They have the surprising ability to stretch vertically into the sky and attack airborne creatures.
Underground Transit. The dunewinder's tunnels are quite large. Other monsters use these passages to travel under the desert sand. If they run into the monstrosity, they better hope it isn't hungry.
Crude Construction. Some of the worm's tunnels aren't very stable though. There is always a chance that one of these passages can collapse.