29. Arabian Sand Gazelle
The Arabian sand gazelle, Gazella marica, exhibits remarkable adaptations to survive the harsh desert environment. During periods of drought, these gazelles can reduce the size of their liver and heart, organs responsible for high metabolic rates, thereby decreasing their oxygen consumption and respiratory water loss. This physiological adjustment allows them to endure extended periods without food or water, a feat unmatched in humans. For more information, see BBC Earth.