Wisconsin's weasels are the smallest members of a family of mammals that includes these other species

Milwaukee Journal Sentinel
Short-tailed weasel shown.
The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. 
The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. 
The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Short-tailed weasel shown. The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
Short-tailed weasel shown.
The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. 
The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. 
The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Short-tailed weasel shown. The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
Short-tailed weasel shown.
The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. 
The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. 
The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Short-tailed weasel shown. The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
Least weasel shown (lower right corner).
The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. 
The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. 
The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Least weasel shown (lower right corner). The long-tailed weasel is the largest weasel found in Wisconsin, though only slightly larger than the short-tailed weasel. They are usually a foot to a foot-and-a-half long with a 4-6 inch black-tipped tail. They are brown on top with cream-colored undersides. The short-tailed weasel is the most common weasel in Wisconsin. They're about a foot long, smaller than the long-tailed. They are similar in appearance to long-tailed weasels except for their shorter 2-4 inch tail — it has a black tip. The least weasel is about only about 6-inches long and has a short tail. They are the smallest carnivore in the world. Their reproduction, dens and diet is similar to other weasels. All three weasel species have fur that can turn white in winter.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
The badger is a robust and powerful member of the weasel family. Adults average around 12-16 pounds. Badgers burrow, creating underground habitats and are mostly solitary except during breeding season. They prey on ground squirrels, moles and other small mammals.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
The fisher is a member of the weasel family. Smaller than otters, Fishers are dark brown with bushy tails. Males weigh around 15 pounds with females weighing around 10-11 pounds. Fisher produce one litter per year consisting of one to five kits. Fishers generally prey upon small mammals like squirrels.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
The mink is a smaller member of the weasel family. They generally weigh 1.5-2 pounds. Males are slightly larger than females. They prey on a wide variety of small animals including muskrats, mice, fish, reptiles, amphibians, waterfowl and eggs. While they prefer to hunt around water bodies, they will travel and forage for food in upland habitats as well. Mink give birth in late spring, producing 5-6 young.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
Wisconsin river otters are semi-aquatic members of the weasel family.Males can weigh in around 25 pounds with females weighing around 18-20 pounds. They have one litter per year with two or three pups. They eat fish and other small aquatic amphibians and reptiles. Otters are great swimmers and are equipped with webbed toes and closable valves in their ears and nose.
Wisconsin river otters are semi-aquatic members of the weasel family.Males can weigh in around 25 pounds with females weighing around 18-20 pounds. They have one litter per year with two or three pups. They eat fish and other small aquatic amphibians and reptiles. Otters are great swimmers and are equipped with webbed toes and closable valves in their ears and nose.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
Wisconsin river otters are semi-aquatic members of the weasel family. Males can weigh in around 25 pounds with females weighing around 18-20 pounds. They have one litter per year with two or three pups. They eat fish and other small aquatic amphibians and reptiles. Otters are great swimmers and are equipped with webbed toes and closable valves in their ears and nose.
Wisconsin river otters are semi-aquatic members of the weasel family. Males can weigh in around 25 pounds with females weighing around 18-20 pounds. They have one litter per year with two or three pups. They eat fish and other small aquatic amphibians and reptiles. Otters are great swimmers and are equipped with webbed toes and closable valves in their ears and nose.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
According to Outdoors reporter Paul Smith, this is NOT a river otter.
According to Outdoors reporter Paul Smith, this is NOT a river otter.
Milwaukee Journal Sentinel Files
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
The pine marten, a smaller member of the weasel family is endangered in Wisconsin. It weighs in around 1-3.5 pounds. The pine marten is a tree climber and creates dens in trees, fallen logs and squirrel nests. They produce one litter in spring with three to four young. They prefer areas with mature or old growth upland conifers and hardwood forests, fallen timbers and woody debris.
Wisconsin Department Of Natural Resources/Snapshot Wisconsin