Utah has six life zones with more than 4000 floral species. Common trees and shrubs include four species of pine and three of juniper; aspen, maple, hawthorn, cottonwood, and chokecherry also flourish, along with the Utah oak, Joshua tree, and blue spruce (the state tree). In 2003, 24 plant species were classified as threatened or endangered in Utah, including five species (San Rafael, Siler pincushion, Wright fishhook, Uinta Basin hookless, and Winkler) of cactus, five species (Shivwitz, Deseret, Holmgren, heliotrope, and Welsh's) of milk-vetch, dwarf bear-poppy,, and autumn buttercup.
Mule deer are the most common of Utah's large mammals. Other mammals include pronghorn antelope, Rocky Mountain bighorn sheep, lynx, grizzly and black bears, and white- and black-tailed jackrabbits. Among native bird species are the great horned owl, plain titmouse, and water ouzel.
In 2003, 23 animal species were listed as threatened or endangered in Utah. Among them were the bald eagle, Utah prairie dog, three species (bonytail, humpback, and Virgin River) chub, whooping crane, two species of sucker, southwestern willow flycatcher, and woundfin.