The bird may be suffering from a neurological disease or other disease and is unable to eat and needs will need help.
Please do not give the bird a bowl of water that is big enough for his head to go in as he may drown. Can you gently dribble water with a dropper slowly down side of beak so the bird can be hydrated? If the dropper is directly put inside beak the bird could asperate.
Here is a UK rescue link for more info and finding help. http://www.pigeonrescue.co.uk/rescuecentres.htm
Scroll down to paramyxovirus: http://www.pigeonrescue.co.uk/conditionsaffectinghead.htm Supportive treatment is necessary if this is the disease the bird is displaying.
Please do not give the bird a bowl of water that is big enough for his head to go in as he may drown. Can you gently dribble water with a dropper slowly down side of beak so the bird can be hydrated? If the dropper is directly put inside beak the bird could asperate.
Here is a UK rescue link for more info and finding help. http://www.pigeonrescue.co.uk/rescuecentres.htm
Scroll down to paramyxovirus: http://www.pigeonrescue.co.uk/conditionsaffectinghead.htm Supportive treatment is necessary if this is the disease the bird is displaying.