On: Birds can see Earth's magnetic fields because of c...

[dang]

Seems to me the first part of the title makes a reasonable whole title, so let's go with that for now.

Also, we changed the URL from http://archive.is/SlcSL. archive.is is an excellent site for archiving, but not for HN submitting, because it's important for readers to see the actual domain. For the same reason, we don't allow link shorteners.

[stan_rogers → dang]

The eye link to magnetic field navigation has been known for years; the mechanism has not been.

[dang → stan_rogers]

Ok, we've put some cryptochromes in the title.