Simplify the following text for a Grade 6 native English-speaking person.
Original: The nest is preferentially built at a height of 3 to 10 m. It is cup-shaped and composed of twigs , small roots , bark strips , moss , other plant material , cloth , paper , and feathers , with occasional mud added to the cup .
Simplified: The nest is normally made at a height of 3 to 10 meters . This cup-shaped nest is made of twigs , small roots , bark strips , moss , other plant material , cloth , paper , and feathers , sometimes with mud added to the cup .