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Deer are a group of mammals that belong to the family Cervidae. They are typically found in wooded areas and forests, and are known for their characteristic long legs, small tails, and antlers (in male deer). They are herbivores, and their diet consists primarily of leaves, grasses, and other vegetation. Some species of deer, such as white-tailed deer and mule deer, are known to be active during the day, while others, like the black-tailed deer, are more active at night. They are known for their grace and agility, and are often seen playing in open fields and meadows.