Bird's Nest Spring (PiP)

"The margins of Waimangu Stream from Frying Pan Lake to east of Inferno Crater are covered with delicate silica formations and colourful mineral deposits containing traces of arsenic, molybdenum, antimony, and tungsten, while the stream bed is home to blue-green algae and filamentous colonies of the photosynthetic bacterium Chloroflexus aurantiacus in a range of colours from bright green to orange.
In the midst of this area is the picturesque Bird's Nest Terrace, a delicate silica terrace with the small volcano-shaped Bird's Nest Spring atop continuously erupting near boiling-hot water about 1 metre (3 ft) high. The terrace is covered in blue-green algae, which cannot survive in the hot stream of water running down from the spring, providing a colourful contrast of green and orange." (Wiki)