What is the physical property of thermals that helps birds prey?

Thermals are rising columns of warm air that form when the sun heats the Earth's surface unevenly. This upward movement of air allows Birds of Prey, such as hawks and eagles, to soar effortlessly without flapping their wings, conserving energy while gaining altitude. By utilizing thermals, these birds can cover large distances in search of food and spot potential prey from high above. The ability to ride thermals is crucial for their hunting strategy and overall survival.