A Brood X cicada on a tree in Kickapoo State Recreation Area on June 10, 2021, near Danville.
University of Illinois lab technician Jocelyn Hedlund gathers Brood X cicada specimens June 11, 2021, in Vermilion County.
Brood X cicadas cover a hawthorn tree June 10, 2021, at Forest Glen Preserve in Vermilion County.
A female Brood X cicada lays eggs on June 11, 2021, leaving a trail of oviposition scars on a branch near Oakwood.
A Brood X cicada June 10, 2021, in the Danville area.
The discarded exoskeleton of a molted Brood X cicada is stuck to a tree June 9, 2021, in the Kickapoo State Recreation Area near Danville.
Brood X cicadas cover a hawthorn tree June 10, 2021, at Forest Glen Preserve in Vermilion County.
A Brood X cicada clings to a tree June 10, 2021, in the Kickapoo State Recreation Area near Danville.
A Brood X cicada lands on a branch June 11, 2021, at Forest Glen Preserve in Vermilion County.
Discarded exoskeletons of Brood X cicadas cover the ground June 10, 2021, at Forest Glen Preserve in Vermilion County.
University of Illinois lab technician Jocelyn Hedlund gathers Brood X cicada specimens June 11, 2021, at Forest Glen Preserve in Vermilion County.
A Brood X cicada on a tree June 10, 2021, at the Kickapoo State Recreation Area near Danville.
Exit holes left by the emergence of Brood X cicadas near a tree at Forest Glen Preserve in Vermilion County on June 11, 2021.
Katie Dana, an entomologist with the Illinois Natural History Survey, gathers Brood X cicada specimens in Vermilion County on June 11, 2021.
A Brood X cicada on a tree June 9, 2021, in the Kickapoo State Recreation Area near Danville.
A Brood X cicada in the Danville area on June 10, 2021.
Brood X cicadas mate in a tree near Oakwood on June 10, 2021.
Katie Dana, an entomologist with the Illinois Natural History Survey gathers Brood X cicada specimens in Vermilion County on June 11, 2021.
A 17-year cicada emerges in a yard in Homewood on May 22, 2007. They’re due back in Chicagoland in 2024.
A newly emerged 17-year Brood XIII cicada nymph molts after scaling a tree in 2007.
A 17-year Brood XIII cicada waits for its wings and new exoskeleton to dry and harden after climbing and molting on a tree in Homewood on May 22, 2007.
A Brood XIII cicada waits for its wings and new exoskeleton to dry and harden after climbing and molting on a tree in a front yard in Homewood on May 22, 2007.
A Brood XIII cicada nymph molts after scaling a tree in Homewood on May 22, 2007.
The translucent, discarded exoskeleton is left behind after a 17-year cicada molt.
A Brood XIII cicada waits for its wings and new exoskeleton to dry and harden on May 22, 2007.
A newly emerged Brood XIII cicada nymph molts in 2007.
Seventeen-year cicadas emerge in a front yard in Homewood on May 22, 2007.
The lacy wings of a 17-year brood cicada are visible as it emerges in Homewood on May 22, 2007.
Cicadas in Elmhurst on May 23, 2007.
Tim Wangler, then 25, re-creates a photo taken of him in 1990 when the the 17-year cicadas returned to Elmhurst on May 23, 2007.
Tim Wangler, 8, gets a close look at a cicada on June 11, 1990, in Elmhurst.
A 17-year cicada rests on a hosta leaf in Elmhurst on May 21, 2007.
A cicada during the emergence on May 21, 2007, in Elmhurst.
A cluster of cicadas cling to a tree in their ecdysis stage at the Bemis Woods Forest Preserve in Western Springs on May 28, 2007.
