Leaves: Same shape as all maples (think Canada flag) but very jagged with deep notches.
Bark: Smooth when young, becomes shaggy with age.
Found: In floodplains and can withstand seasonal floods.

photo: MnDNR

Leaf: Oval with double-edged teeth. Feel rough when rubbed.
Bark: Long trunk that's ashy gray with many furrows/ridges that get deeper with age.
Note: Dutch elm disease killed off many of these trees across the Eastern U.S. in the 1970s and today prevents many from reaching full age.

photos: MnDNR

Leaves: Triangular.
Bark: Light gray on young trees and dark gray and rough on older trees.
Fruit: Fluffy, cottony catkins that disperse in wind in May - June.

photos: MnDNR

Blooms: July - September
Found: In sunny spots along shores.
Petals:Pink to purple flowers.

Blooms: June - August
Found: In sunny fields and rocky areas.
Petals: Tiny purple with orangish tips, packed around a gray cone.

photos: Pixabay

Blooms: June - October
Found: Sunny fields, along roads or lakeshores.
Petals: Cheery yellow petals swirl around a black center.

photo: Luke Lawreszuk / Sprayedout.com

MN is home to a few native crayfish, plus an invasive one. They all look like baby lobsters that reach 2-5 inches long.
Found: In streams and rivers with rocky bottoms and logs to hide under.
Fun Fact: While humans have 46 chromosomes, crayfish have 200. This allows them to self-amputate limbs if caught and then re-grow them.

ALAN SCHMIERER, CC0, via Wikimedia Commons

Found: Near tall grasses in late summer and fall.
Fun Fact: They are jumping phenoms, leaping 20 times their body length, which equates to a human jumping 120 feet.

photo: Will Brown / WikiMedia CC

This water beetle is usually found swimming on the surface of a lake or pond where they swim wildly in circles. This movement makes small waves, which may help them find insects to eat via echolocation.

Udo Schmidt from Deutschland, CC via Wikimedia Commons & Under the same moon via Flickr CC

Appearance: Bright orange with black.
Found: High in treetops of open woods. They have a loud, rich, whistling song.

photo: TonyCastro/Wikimedia CC & Kelly Colgan Aza/Flickr CC

Appearance: Brilliant yellow with black wings and cap.
Found: In areas with thistle plants and usually in small flocks.

photo: Mdf / WikiMedia CC

Appearance: These two woodpeckers are nearly identical with the Downy a little smaller at ~6" and Hairy ~9". The female doesn't have the red mark on head.

Found: In the forest.

Photo: Andrew McKinlay/FlickrCC

Appearance: Semi-circle with brown top and pure white underside.
Found: On tree trunks of hardwood trees and some conifers.
CAUTION: Never eat any mushroom unless knowledgeable.

photos: Cyndy Sims Parr/FlickrCC
George Chernilevsky/Public domain

Blooms: June - September
Found: In shady forests under pine needles.
Petals: Ghostly white.
Fun Fact: Technically, this is a flower, but it doesn't need the sun to grow and relies on underground fungi.

photo: Checkermallow / FlickrCC

Everybody poops, and sometimes we're lucky enough to find proof on the trail. Rabbit and deer (photo) poop/scat are like rounded pellets. Carnivores often have fur in their droppings.

photo: Kevin Casper / CC0 public domain

Deer hooves (photo) are commonly seen on or near trails. Their hooves make two side-by-side teardrop tracks. Other common prints are from raccoons, rabbits, opossums, and coyotes.

photo: QS Wiki Account, CC0, via Wikimedia Commons

Many animals, such as squirrels, raccoons, owls, bats, weasels, porcupines, songbirds, and others, make their homes inside tree holes. The holes can occur from tree decay or broken branches, or else with the help of woodpeckers. While it's rare to see the occupant, let's assume it's a home for someone.

photo: Lorianne DiSabato / Flickr CC

Color: Brown, olive green, or reddish.
Found: Near water or moist areas.
Toads are amphibians that start life as tadpoles and then emerge onto dry land as tiny toadlets about the length of a fingernail.

photo: National Park Service

There are about 130 species of fishes found naturally in Minnesota. The most common ones to swim near shore and under docks are sunfish (photo). Seeing any fish will earn you points for this item.

photo: Joe Mabel, CC via Wikimedia