Three squirrels were observed eating corn that was nailed to a tree in a backyard. The observer had questions about how much corn the squirrels would eat in a day, how many different squirrels would come to feed, and whether fighting squirrels were male/female pairs or not. Additional questions arose about types of squirrels, their winter food sources, and favorite foods. Squirrels eat a variety of nuts, seeds, fruits, fungi, and human-provided foods like dried corn. There are over 300 squirrel species worldwide and they gather food all year to survive winter hibernation or dormancy periods.