Here is a photo taken in Duluth, MN. This is an area full of iron ores – so much so that the land is the color of rust.
You can see evidence of iron by the color of the river and rocks.
Here are the rusty squirrels I mentioned in class. The squirrels have figured out how to blend in with their lovely coats that are a perfect match for iron oxide.
Rusty Squirrels Blend in with Iron Rich Terraine
Taconite is the most common ore in this area.