This is fascinating and opens new doors to understanding how life on Earth is interconnected.
"What do a 40-ton whale and near-weightless butterfly have in common? They both migrate every year, along with billions of other animals like ducks, turtles and moths. Now, a new study in Science explains how important migration is to shaping ecosystems on Earth.
The role of migratory species – those that move from one place to another seasonally – is more important than many have thought."http://www.eurekalert.org/features/kids/2014-04/aaft-wab032814.php