Vintage Chicago Tribune: Cicada invasion

It’s about to get loud.

Three species of periodical cicadas, known as Brood XIII, are expected to emerge this month from their underground habitats. The nymphs, which began as tiny eggs laid inside tree branches, have remained buried in soil nibbling on tree sap since 2007 — the same year the iPhone was introduced.

Illinois will soon be cicada central when 2 broods converge on state in historic emergence

What makes these creatures different from the cicadas that we see every summer?