Storks Unravel the Mystery of Bird Migration

Previously, people didn't know how birds survived the winter; they only knew that they disappeared in
winter and reappeared in spring. Some scientists believed they hibernated, and some even speculated that birds flew to the moon and then returned! 

In the spring of 1822, a stork with a spear stuck in its neck flew from Central Africa to the German town of Klutz, thus revealing the mystery. 

Fortunately, the spear did not pierce its throat or trachea, and it even used this to fly three thousand kilometers! Today, we have a better understanding of bird migration routes, and therefore a deeper understanding of the spread of avian influenza, but this has not stopped the increasing impact of the disease.