Pigeon babies sick

by Jadranka
(Macedonia)

We raced two one-month-old pigeons since they come into the terrace of public building /the nest was in the garret/. Their mother kept coming from time to time for feeding them, but also we fed them with wholegrain cereals after consultation with experienced pet shop owner. It was the big problem that they didn't drink water, and we tried sometimes to water them by putting carefully water in the beak. Unfortunately, a few days later we found one of kids death. No any external signs... We continued caring for the other kid as mother after that abandoned him and never appeared again.
But we noted something, increased swollen sewer /cloacae/, harden remains of feces /green-yellow colored/ on the sewer opening, and a wound nearby sewer, right in the swollen place. We look for vet help, he told us that chances for survival were low, there is suspicion of prolapsed cloacae and it could not be treated. Where we wrong? Maybe our poor experience of racing pigeons result to their death...
Would you like to answer me, I hope I provide you enough information...

Thank you in advance!