This is another one of those annually-appearing IotDs, but if you haven't seen it before, it's new to you, right? And this is one worth noticing every year. But for time's sake I will duplicate my entry for it from 2001.
A group of highly-endangered whooping cranes lives in Wisconsin at the Necedah national wildlife refuge. Problem: how to get them to migrate south for the winter successfully - especially to go to a place where they'll be safe.
Answer: LEAD them south via ultralight aircraft.
Details at
http://www.operationmigration.org/