How many species of trees and other vascular plants are in Yellowstone National Park ?
[[ File:Zoo 042 edited.jpg | thumb | right | Balkan chamois " ( Rupicapra rupicapra balcanica ) " , a goat – antelope species found in Europe and Carpathian Mountains ]] The park 's vegetation comprises thick forests ( 66 %) mountain pastures , meadows and rocky ground above the forests .