The arithmetic of spring
The arithmetic of spring
The arithmetic of spring [3:38 · download]

 

Proof that spring has arrived:

  balmy evening
+   American robin (Turdus migratorius)
+   American woodcock (Scolopax minor)
+   Wood frog (Rana sylvatica)
=  The sound of early spring in North America
tangle

Addition :: snowmelt fills the vernal pool in question

multiplication

Multiplication :: a mass of frog eggs