I don't wish to alarm anyone but there seems to be alot of unexplained sudden deaths and illnesses of ducks and chickens lately, I am very lucky in the shed my ducks sleep they have room for food and water over night and I get to see just how often they eat and drink through out the night and early morning,I except this isnt practical for us all
my ducks like most are now in for 14 hours over night and as the nights get longer this will rise to 15 maybe 16 hours,
I wondered if dehydration could be a factor of the birds becoming unwell if you consider how small they actually are, i've been on google and found the following link which covers various symptons in birds with the names of illnesses different symptoms can lead to, hope it helps us all to perhaps find out quickly what may be wrong with any ill birds we may have
http://poultry.msstate.edu/extension/pdf/diseases_poultry_diagnosis_symptoms.pdf