what's the difference between a deer and a reindeer

The main difference between a deer and a reindeer is that reindeer are domesticated animals bred for use as pack animals and sleigh pullers, while deer are wild animals. Reindeer have a stronger skeletal structure and thicker fur to help them withstand the harsh Arctic winter, while deer are adapted to warmer climates and have a more delicate bone structure. Reindeer also have a wider range of motion in their hooves and are better able to walk on snow and ice. Additionally, reindeer have a unique adaptation to help them stay warm, called "facultative endothermy," which allows them to raise their body temperature by