- Smoke spews six miles into the air
- Mountain is home to world's only population of pink iguanas
- Park service says tourism not threatened.
Early Monday morning, the Wolf Volcano on Isabela Island -- the highest volcano in the archipelago -- erupted for the first time in 33 years, the Galapagos National Park service said.
The lava glowed orange through the night as it coursed down the mountainside.
World's only pink iguanas
Wolf volcano, which rises more than 5,500 feet above the sea, is home to the world's only population of pink iguanas, whose habitat is now threatened by the eruption. The pink iguanas share the mountain with yellow iguanas and giant tortoises.
The eruption, inspiring in its beauty, has created concern that the ecosystem Darwin studied may be damaged.
Darwin, an English naturalist, arrived in the islands in 1835 at the age of 26. His observations of different species in the archipelago's rich ecosystem led him to develop the theory of natural selection -- one he wrote about, most famously, in the book titled "On the Origin of Species," published in 1859.
The Galapagos Islands straddle the equator 563 miles west of mainland Ecuador, to which they belong.
The park service said the eruption does not, at the moment, pose a threat to tourism.