The animals (both vertebrates and invertebrates) on Wisconsin's Natural Heritage Working List are species known or suspected to be rare in the state. It includes Species of Greatest …

American Marten (Martes americana), a State Endangered mammal, lives in mature, dense conifer forests, mixed conifer-hardwood, and hardwood dominated forests, including hemlock, …

Blanchard's Cricket Frog (Acris blanchardi), listed as Endangered in Wisconsin, prefers ponds, lakes, and a variety of habitats along and adjacent to streams and rivers including marshes, …

Wood Turtle (Glyptemys insculpta), a Threatened Species in Wisconsin, prefers rivers and streams with adjacent riparian wetlands and upland deciduous forests.

Queensnake (Regina septemvittata), listed as Endangered in Wisconsin, prefers clear warm-water streams and small rivers. This crayfish specialist is typically associated with moderate to …

It includes species legally designated as "endangered" or "threatened," as well as species in the advisory "special concern" category. Species become rare for a number of reasons, including …

Northern Flying Squirrel (Glaucomys sabrinus) is a Special Concern species in Wisconsin and a Protected Wild Animal under NR 10.02 Wis. Admin.

Loggerhead Shrike (Lanius ludovicianus), listed as Endangered in Wisconsin, prefers open country with scattered trees and shrubs (usually hawthorne and red cedar), and edge habitat …

Timber Rattlesnake (Crotalus horridus) is a Special Concern species and a Protected Wild Animal.Adult males and non-gravid adult females prefer deciduous forests and woodland …

Attenuipyga vanduzeei is a Wisconsin Endangered and Federal Species of Concern leafhopper that inhabits limestone bluff "goat prairies" and sandstone bluff prairie remnants. Host plants …