The river is a known habitat for multiple bird and fish species native to Attu island.
The Peaceful River is also a known habitat for various species of salmon.
Their only known habitats were sunken wood and hydrothermal vents.
By 2007, it was limited to only 80 known habitats.
Three new species of Lepanthes orchids were discovered in the park in 2009 and is so far their only known habitat.
The question of the little known habitat of Tetrix ceperoi has come into greater study recently.
An essential aspect of survival includes reducing siltation in known habitats.
Much of its known habitat has been developed or degraded, and its host plants no longer grow in the area.
Therefore it was concluded that the Waianiwaniwa catchment is the most important known habitat for this species.
This range is the only known habitat of the Vortriede's spineflower.