Why do deer travel in groups?

Deer form herds mainly to survive predators. When many animals stay together, they can spot danger faster than one deer alone.

In groups such as spotted deer (Chital), the herd effectively has more senses working at once. With more eyes, ears, and noses scanning the scrubland, predators like leopards or crocodiles are more likely to be noticed sooner. At the same time, a lone animal is easier to pick out. Being in a tight group spreads the danger, so even young fawns can feed in open clearings with less risk.