In Uganda's Queen Elizabeth National Park, some lions take napping to new heights—quite literally. The tree-climbing lions of the Ishasha Sector have a habit of sprawling across the branches of giant fig trees, as seen in today's image. Experts believe they climb to escape ground-level heat or pesky insects, but these naps make for an unforgettable sight. This vast park spans volcanic craters, open plains and dense forests. A safari here promises encounters with Uganda's incredible wildlife.