Why are so many acorns on the ground in Chicago? It's a 'mast year,' experts say - Chicago Sun-Times

The abundance in acorns this fall is the result of a phenomenon that happens once every few years, in which oak trees produce far more acorns than normal.

Why Are There So Many Acorns in Illinois This Fall?

Mast ahead in production in a surprisely good year for nuts - Chicago Sun- Times

Why Are There So Many Acorns in Illinois This Fall?

Why are there so many acorns this season? An expert explains - CBS New York

Why Are There So Many Acorns in Illinois This Fall?

Why Are There So Many Acorns in Illinois This Fall?

Why Are There So Many Acorns in Illinois This Fall?

Oaks & Acorns: The Mystery of the Mast – The Botanical Journey

Why Are There So Many Acorns in Illinois This Fall?

Oak trees keep dropping acorns this fall. Here's how a 'mast' year impacts North Texas

TIL that California black acorns were used by California native Americans as a staple food. : r/todayilearned

Yes, there are a lot of acorns on the ground this season. Here's why. - The Boston Globe

What is a Mast Year? How and Why it Happens - Woodland Trust

Why Are There So Many Acorns in Illinois This Fall?