Past and present participles often function as adjectives that describe nouns. Here are some examples:

The crying baby drew a long breath and sucked in a spider crouching in the corner of the crib.

Which baby? The crying baby. Which spider? The one that was crouching in the corner.

The mangled pair of sunglasses, bruised face, broken arm, and bleeding knees meant Genette had taken another spill on her mountain bike.

Which pair of sunglasses? The mangled pair. Which face? The bruised one. Which arm? The broken one. Which knees? The bleeding ones.