Rudolph and his friends might be too weak for Santa this year.
Warm winters affect reindeer's health by depriving them of the food they need to support gestation.
Researchers investigate the cause of the alarming deaths of reindeer.
The death of 323 reindeer in Norway alarmed the experts.
Everyone knows about the story of Santa's reindeer and their important job each Christmas. Every year, these animals leap into the air with Santa's sleigh, flying around the world to help him deliver presents. But what goes into actually pulling the sleigh? It's not all magic; it's also a little bit...