This is the biggest national park in the USA.
Yellowstone
This park activity involves two wheels.
Biking
This challenge is associated with global warming and affects parks.
Climate change
This big animal found in some parks can be brown or black.
The national park with the big trees.
Sequoia National Park
This park activity involves walking on trails.
Hiking
An example of this challenge would be someone bringing firewood from one parl to another which causes disruption.
Foreign species
This animal commonly comes up to people asking for food.
Marmot
The oldest national park.
Yellowstone
This park activity is associated with the Great Sand Dunes national park.
Sand surfing
This challenge is associated with the killing of endangered animals for fun.
Poaching
This animal is part of the cat family.
Mountain Lion
This national park offers helicopter rides and rafting in the river that runs through it.
Grand Canyon National Park
This is the most common park activity.
Camping
Where some animals go instead of being killed or are injured.
Wildlife rehabilitators
This animal is commonly found in the northern most part of the United States.
Alaskan Red Fox