Newts can be toxic to predators, but are the Mazama Newts at Crater Lake protected by toxins?
Learn about the fish found in Crater Lake.
The signal crayfish was introduced to Crater Lake in 1914 and ever since has been degrading the Crater Lake ecosystem.
View this page to find detailed information on the environmental monitoring of Crater Lake and the springs and seeps that flow into Crater Lake.
Last Updated: 03/02/2015