A large deer that live in cold, snowy places like the Arctic. They have thick fur to keep them warm in the winter. In many Christmas stories, they are shown flying through the night sky with Santa Claus.

Example

1. Reindeer have thick coats to keep them warm in the cold weather.
2. Reindeer have antlers that they shed each year.
3. Santa Claus's sleigh is pulled by reindeer.