“Squirrels—Nature’s little speed bumps”

“Squirrels—Nature’s little speed bumps” is a jocular saying that has been printed on many images. Squirrels get run over frequently by cars.
 
“Squirrels - Nature’s little speed bumps” was posted on the newsgroup rec.motorcycles on September 16, 2002.
 
       
Google Groups: rec.motorcycles
It’s officially squirrel season. 
Knuckles Muldoon
9/16/02
Squirrels - Nature’s little speed bumps.
😛
 
Google Books
Vital Signs
By Jeffrey Dobkin
Danielle Adams Publishing
2006
Pg. ?:
Squirrels ~ Nature’s little speed bumps
 
5 April 2006, Palm Beach Post (West Palm Beach, FL), “Stuck in traffic? Bumper stickers can lighten load” by Mike Tighe, Boynton Beach sec.,  pg. 6, col. 3:
Squirrels: Nature’s little speed bumps.
 
22 September 2006, Washington (DC) Post, “Remedies for When You’re Feeling Squirrelly,” pg. B3:
I prefer to think of squirrels as nature’s little speed bumps.
—Deborah Davidson, Oakton
   
Google Groups: talk.religion.course-miracle
Seen on a T-shirt
Sharon
10/13/06
“Seen on a T-shirt” continued….
(...)
Squirrels: Nature’s little speed bumps.
 
Twitter 
montesinos
@montesinos
squirrels: nature’s little speed bumps
4:53 PM - 13 Oct 2007
   
Twitter
Siim Teller
@teller
Squirrels - nature’s little speed bumps.
10:11 AM - 10 Sep 2008
   
Twitter
Paul Peterson
@sandscribbler
T-shirt: “Squirrels: nature’s little speed bumps.”
4:10 PM - 14 Nov 2008
 
Twitter
Dave Walton
@waltonagseed
Replying to @DDFalpha
Lol….  squirrels=nature’s little speed bumps.
11:10 AM - 23 Mar 2018