A PDF field guide to the species reported in and around Cook County, with common and scientific names and up to 3 photos of each, laid out for use in the field and offline.
The animals people report most often in and around Cook County include Tricolored Bumble Bee, Half-Black Bumblebee, Confusing Bumblebee, Yellow-Banded Bumblebee and Common Loon. Plants lead the list with 31 species, followed by 8 insects and 6 birds.
The 20 species reported most often here, of 50 in the full guide.

Tricolored Bumble Bee
Bunchberry

Half-Black Bumblebee

Confusing Bumblebee

Shotbush

Yellow-Banded Bumblebee
Tell me what you're looking for, and I'll do my best to answer.
Bluebead
Tansy

Bigleaf Aster
Common Loon

Marguerite

Canada Beadruby

Arborvitae
Moose Maple
Goosander

Twistedstalk
Fireweed
Tell me what you're looking for, and I'll do my best to answer.
King Devil
Red Squirrel