While pigeons might seem dirty, dumb, and fill you with the urge to poison them in the park, the ubiquitous urban birds are actually quite clever, as research examples have shown. Not only that, they use their beaks like straws to suck up water, while most other birds have to rely on getting a few drops in their mouths and then tilting their heads backward to let the water trickle down their throats. On second thought, perhaps I'll let the pigeons live.