You beat me to it Pat
We call the ability to drink like a pigeon, 'syphoning', Doves also drink in the same way. An extremely thirsty pigeon can suck up water for what seems like ages to us, and to prompt a dehydrated pigeon to drink is simply dip its beak into water for a couple of seconds and 9 times out of 10 it will suddenly guzzle!!.
This only applys to pigeons and doves, do NOT try this with other birds as you will probably choke them.
Tragus