1. Mammal Skulls Envirothon, 2010

4. Short-tailed shrew Insectivore Red-tipped teeth Venomous mammal. Regular front feet (as opposed to moles) Eat mice

7. Wood Chuck Rodent Large front incisors (enamel often orange) Gap between molars and incisors

10. The Whitetail Deer, Odocoileus virginianus, The most widespread artiodactyl found in North America. Males of the species, possess antlers which are shed from January to March. Grow out again in April or May. Good eyesight and acute hearing, but depend mainly on their sense of smell to detect danger. No incisors on the top,

13. River Otters Long, streamlined animals with a thick tapered tail and short legs. Flatter skull than bobcat with triangular brain case Found in and near fresh water rivers and lakes Range throughout much of the northern US and Canada as well as the southeast US

16. Mink Found in every state except Arizona. Adult Minks grow to about 2 feet in length, with up to half of this length being the tail. A member of the weasel family Carnivores - feed on small vertebrates and occasional insects

19. Ermine Also known as the Weasel Found in the north temperate and frigid sectors of Eurasia and North America. Carnivores that hunt primarily at night. They are specialist predators of small, warm blooded vertebrates, preferably mammals.

22. Gray Fox ( Urocyon cinereoargenteus) Unique among canids in its ability to climb trees. Strong, hooked claws that allow them to scramble up trees to avoid predators or to get fruit. Mostly nocturnal and dens during the day in hollow trees. A solitary hunter and eats a wide variety of food including small mammals, birds, small invertebrates and some plants. Top of skull U-shaped. Black tipped tail.

25. Red Fox (Vulpes vulpes) Native to North America, Europe and most of Asia and has been introduced to Australia and Africa. A member of the order Carnivora An omnivore. It mostly eats rodents, lagomorphs, insects, fruit and occasionally carrion. White tipped tail Prefers grasslands Top of skull V-shaped

28. Pocket Gophers 37 species of pocket gophers found in North America. Small specialized mammals Heavy front limbs well adapted for burrowing. Live most their lives underground in elaborate tunnels and emerge only at night mainly to breed. The name "pocket" gopher comes from their large cheek pouches used to store food Larger than mouse, two grooves on upper incisors

31. Moles Fossorial or underground dwelling mammals Dig tunnels Forage on subterranean invertebrates. Bodies are streamlined, the eyes are tiny, the legs are short, and external ears are lacking. Forelimbs, armed with large flat claws, are positioned for powerful digging movements. Flat skull Insectivore

34. Voles 143 species of voles found world wide. Small mouse-like rodents that occupy nearly all habitat types. Can be distinguished from mice by their short tails and robust body. A favorite food source for many predators such as owls and fox. Family Muridae and the subfamily Arvicolinae, which also includes lemmings. Molars zig-zag. Smaller ears, shorter tail than mouse

37. Mouse The term "mouse" refers to any number of small rodents within the Muridae family. The House mouse Mus musculus, is often associated with human populations and can be found on every continent. Molars are straight Mice, like all rodents, have ever growing incisors, and therefore, need to chew on wood or other materials to wear them down. This, along with their appreciation for human food and crops, and the propensity to spread disease, causes the mouse to be one of humanity's worst pests.

40. Bobcat Indigenous throughout North America. Lynx rufus. Bobcats are strict carnivores (meat eaters).

43. Coyote Found from Central America north through central Unlike its larger relative, the wolf, coyotes are less likely to form packs often hunting in pairs, or in family units depending on prey availability. Adaptable -utilize a range of habitats including forests, clear cuts, prairie and farm land. Sagittal crest on back of skull, convex depressions Above eye

46. The American Opossum Ranges in North America, from Central America and Mexico in the south, through the United States east of the Rocky Mountains and north into southwestern Ontario. They have a long head with a pointed snout and long whiskers. All opossums have long, prehensile tails with a scaly appearance. Opossums are omnivores with a wide diet including fruits, grains, insects and carrion. 50 teeth…more than any other mammal

49. Cottontail Rabbit The 13 species of Cottontail rabbits can be found throughout much of North America. Very adaptive and occupy all terrains and most habitats. Born altricial, or naked of hair and are dependent on their mothers for many weeks. Two peg-like incisors behind front incisors, Lacy network on side of skull

52. American Badger Found primarily on the great plains of North America. One of the larger members of the Mustelidae family Solitary animal. Excellent digger using its powerful forelimbs to tunnel rapidly through the soil. Triangular brain case on skull Last 2 molars are triangular

55. American Beaver The largest rodent found in North America. Aquatic herbivores Make large dams of wood and mud to flood and create habitat. Using their large incisors, beavers can chew through the biggest trees.

58. Muskrat Aquatic rodent. An herbivore that chews on small saplings for food as well as eating a variety of other plants. Muskrats were once heavily trapped for their fur. Decline in demand has allowed this species to overpopulate many areas. Found over much of North America with the exception of the Southwest.

61. Raccoon black bandit like masked and ringed tail. nocturnal omnivores found from southern Canada to Panama. diet consist of crayfish, crabs, frogs, fish, nuts seeds and berries

64. muskox Thought to have crossed the Bering Strait to Canada 90 000 years ago Lifts and drops its massive head to break the snow crust when it becomes too hard to paw through Engages in elaborate head-butting clashes to determine dominance and possession of a herd

65. Test Your Knowledge

67. White tailed deer

69. Short-tailed Shrew

71. Cottontail rabbit

72. Similar, but different. What is each?

73. BobcatOtter

74. Similar, but different. What is each?

75. Red FoxGray Fox

76. Similar, but different. What is each?

77. WoodchuckBeaver

78. Similar, but different. What is each?

79. Mink Ermine

80. Similar but different. Which is which?

81. ShrewMole

82. Similar but different. Which is which?

83. Mouse Pocket Gopher Vole

84. Similar but different. Which is which?

85. MuskratBeaver

87. Coyote

89. Oppossum

91. Muskox