Hi there,   
I'm starting to price the final things I need to set up my first loft.  It's a ridiculously obvious question, but how much do birds drink?    
I'll have about a dozen, and have no idea what size of drinker I need to buy.    Also, several sites offer poultry drinkers as being suitable for pigeons.  I know pigeons drink by sucking unlike chickens, is this type of drinker OK?   
Cheers