Pigeons. In trees.

I was sitting in this park the other day, eating a bagel, and I found myself staring at a tree.  Something wasn't quite right.

There were plump, blobby-looking pigeons in the tree!  I know!  My brain had registered the strangeness before I was even aware of it.  Buildings, utility wires, fire escapes...all natural places for city-dwelling pigeons to be.  But trees?  How odd.