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.
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People most often report Tricolored Bumble Bee, Half-Black Bumblebee, Confusing Bumblebee, Yellow-Banded Bumblebee and Common Loon in and around Cook County. Plants lead the list with 53 species, followed by 12 insects and 8 birds.
The 20 species reported most often here, of 79 in the full guide.

Tricolored Bumble Bee
Bunchberry

Half-Black Bumblebee

Confusing Bumblebee

Shotbush
Bluebead

Yellow-Banded Bumblebee

Bigleaf Aster
Tansy

Marguerite
Common Loon

Canada Beadruby
Goosander
Moose Maple

Arborvitae

Twistedstalk
Fireweed
King Devil

Bitterroot