Do you mean Arctic *Ocean*? Do you think that bat guano is the *only* type of mining covered by the Guano Treaty?
Your words in post number 61 were: For a third, "Wrangel" is only a guano island, protected by the Guano Treaty only as long as bat guano is being actively mined there by U.S. citizens.
So what kind of other creatures produce guano on Wrangel Island?