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?
The burden to prove that the Guano Treaty applies to Russia's Wrangel island would be on whomever claims that American territorial soveriegnty applies there.
That wouldn't be me, by the way.