Some bird species around the world are renowned for their remarkable ability to soar at high altitudes.
Here are the five highest-flying birds in the world.
Ruppell's griffon vulture: This vulture can fly to heights of 37,100 ft (11,300 m) and is considered the world's highest-flying bird. It's found in the Sahel region of central Africa and is important to the local ecosystem.
Bar-headed goose: This bird can fly to heights of 29,000 ft (8,800 m) and is found in high-altitude lakes in Asia.
Whooper swan: This bird can fly to heights of 27,000 ft (8,200 m) and is found in wetland areas in Europe and Asia.
Common crane: This bird can fly to heights of 33,000 ft (10,000 m) and is found in Northern Europe and Asia.
Alpine chough: This bird can fly to heights of 26,500 ft and is found in the high mountains of Europe, northern Africa, and Asia.
Some bird species around the world are renowned for their remarkable ability to soar at high altitudes.