* During the summer: They mainly graze on grasses, herbs, and lichens. They can eat up to 10% of their body weight in a day, which can be about 10-15 pounds for an adult reindeer.
* During the winter: Their diet shifts to mostly lichen, which they dig up from under the snow. They can eat up to 5% of their body weight daily, which is about 5-7.5 pounds.
Fun fact: Reindeer have a special adaptation for eating lichen - they have a long, narrow snout that helps them to reach and dig it out from under the snow.