Related Clues:

• Fits one inside the next
• Return-flight destinations?
• Homes for 46-Down
• Sparrow homes
• 70 Across homes
• Fits inside snugly
• Natural homes
• Stacks, in a way
• Digs made of twigs
• Kite sites
• Fits one inside another
• Places for some newborns
• Forest homes
• Sparrows' homes
• Where early birds bring their worms