It was founded in 1934 to protect animals and vegetation in three ecoregions: savannah, mountain and swamp.
This included 21,220 plants and 2.6 km of fencing to protect recovering vegetation.
However, in some cases, access is prohibited to protect rare vegetation.
The grub-symbiote would protect vegetation by devouring what Thread managed to evade the dragons' fire.
Workers build roads and platforms of ice to protect the soil and vegetation.
But it has refocused attention on the ozone layer, which protects people and other animals as well as vegetation from the sun's harmful ultraviolet rays.
The preserve protects a population of Eastern Hemlock trees and other vegetation more typically found further west, in the Appalachian Mountains.
Boardwalks were constructed over the dunes to protect vegetation.
The grubs might protect the land and vegetation, but dragons were still needed to repel Thread from human habitations and beastholds.
They also seem to restore and protect vegetation Thread damages.