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Oak trees provide acorn-ucopia to hungry woodland wildlife

 Many acorns develop on the branches of a bur oak near Canon Falls. Bur oak acorns have distinctively hairy-looking caps. There are about seven acorns forming amidst dark green leaves with silver backs.
Contributed
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Paul Broenen via iNaturalist
Many acorns develop on the branches of a bur oak near Cannon Falls. Bur oak acorns have distinctively hairy-looking caps.

During the Phenology Report for the week of Sept. 2, 2025, Staff Phenologist John Latimer previews September in Minnesota and speaks in defense of crane flies.

It’s a good year to be a bear, chipmunk, or squirrel: White oak trees are dropping acorns in huge numbers, which provide critters with vital winter stores. (These hyper-productive years are called mast years.)

Oaks have their own reasons for providing these occasional super-feasts; the sheer number of acorns produced overwhelm the appetite and ability of the critters to gather them all. In addition, some unlucky critter will forget where they stashed an acorn or two or die before they get a chance to eat it. The leftover acorns, planted in loose soil, are in a perfect spot to sprout.

Learn about this and more in this week’s phenology report!

Topics

  • Introduction (0:00-0:22)
  • September in Minnesota: A preview (0:22-10:21)
  • A mast year for white oaks (10:21-11:47)
  • Insects (11:47-12:55)
  • Fruits (13:05-14:07)
  • Mountain maples (14:07-14:20)
  • Robins moving in flocks (14:20-15:00)
  • Nighthawk migration (15:00-15:21)
  • Crane flies (15:21-16:19)
  • Conclusion (16:19-16:43)

What have you seen out there? Let us know: email us at comments@kaxe.org or text us at 218-326-1234.

That does it for this week! For more phenology, subscribe to our Season Watch Newsletter or visit the Season Watch Facebook page.

Funding for this project was provided by the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources (LCCMR).

Charlie Mitchell (she/they) joined KAXE in February of 2022. Charlie creates the Season Watch Newsletter, produces the Phenology Talkbacks show, coordinates the Phenology in the Classroom program, and writes nature-related stories for KAXE's website. Essentailly, Charlie is John Latimer's faithful sidekick and makes sure all of KAXE's nature/phenology programs find a second life online and in podcast form.


With a background in ecology and evolutionary biology, Charlie enjoys learning a little bit about everything, whether it's plants, mushrooms, or the star-nosed mole. (Fun fact: Moles store fat in their tails, so they don't outgrow their tunnels every time conditions are good.)
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