Lassen Volcanic National Park is home to approximately 300 species of vertebrates, which includes birds, mammals, reptiles, amphibians, and fish. The richness of species is contributed to the variety of habitats found within three ecological zones in Lassen Volcanic National Park.
Lassen Volcanic is also home to more than 350 species of invertebrates including insects and spiders. One of the most noticeable species is the California Tortoiseshell butterfly. These butterflies are orange-brown in color and can be seen by the thousands at times especially on the tops of peaks where wind currents have carried them.
Last updated: November 4, 2020