Simplify the following text for a Grade 11 native English-speaking person.
Original: Various species have adapted to not only blend with the foliage , but to mimic it , appearing as either living or withered leaves , sticks , tree bark , blades of grass , flowers , or even stones .
Simplified: Various species have evolved to not only blend with the foliage , but to mimic it , appearing as either living or withered leaves , sticks , tree bark , blades of grass , flowers , or even stones .