posted on Feb, 15 2005 @ 03:02 PM
This is just a guess, but the description sounds like an armadillo -- common in my state of Georgia and throughout the South, but this would be the
first I've heard of one that north.
Although ... are you in the part of Iowa near the Mississippi? That might explain their easy migration north.
From the above link:
"The armadillo is an armored mammal related to anteaters and sloths. The peba, or nine-banded armadillo, is found in South and Central America and in
Texas, southern Oklahoma, Louisiana, Arkansas, Mississippi, and parts of Florida. The six-banded armadillo; the three-banded armadillo, or apar; and
the giant armadillo are among the South American species."