What do these have in common?

Coat of Arms, Motto, Flag, Song, Flower, Bird, Tree, Fish, Animal, Wildlife Animal, Domesticated Animal, Dairy Cow, Mineral, Rock, Symbol of Peace, Insect, Soil, Fossil, Dog, Beverage, Grain, Dance, Microbe, Bacterium

They are all stuff that the State of Wisconsin has designated as "official" State Symbols. More specifically:

• Coat of Arms:
• Motto: "Forward"
• Flag:
• Song: "On Wisconsin!"
• Flower: Wood Violet
• Bird: Robin (Turdus migratorius)
• Tree: Sugar Maple (Acer saccharum)
• Fish: Muskellunge (Esox masquinongy Mitchell)
• State Animal: Badger (Taxidea taxus)
• Wildlife Animal: White-tailed Deer (Odocoileus virginianus)
• Domesticated Animal: Dairy Cow (Bos taurus)
• Mineral: Galena (Lead sulphide)
• Rock: Red Granite
• Symbol of Peace: Mourning Dove (Zenaidura macroura corolinensis linnaus)
• State Insect: Honeybee (Apis mellifera)
• Soil: Antigo Silt Loam (Typic glossoboralf)
• State Fossil: Trilobite (Calymene celebra)
• Dog: American Water Spaniel
• Beverage: Milk (Cookius Dippitus)
• Grain: Corn (Zea mays)
• Dance: Polka
• Microbe: Bacterium (Lactococcus Lactis)
  

Wait a minute! Bacterium? Who would want to honor something that makes people sick? Actually, we do honor things that make us sick, but we shouldn't go there right now.

It seems that Wisconsin is famous for its cheese. Lactococcus Lactis is the beasty that turns milk into cheese. Ergo ....

No, I'm not making this up.