That is true.
UPDATE:
Right now, they're getting Metranidazole [50 mg, roughly every 12 h.] It's the second day of medication.
They were fed [normal Bread and wheat bread] just now, and even the pied took the food in once we put it in its beak, but he doesnt seem to be better. Just sits and sleeps all the time, stands up occasionally.
He looks weak [obviously].
We'll weight them surely.
The other one [blue shoulder] is quite better. He drank from the bowl himself. He is walking around the house, is a little alert as well. The droppings seem to be lesser.
The third one [blackshoulder], who is fine and hasnt gotten this, he does 'occasional' the liquid watery yellow stuff, so we started him on Metranidazole too. Is that okay? He is eating and drinking by himself though, thank god.
AGES:
Pied and the black shoulder were born together. April 2013. We have them since. [which makes all of this a lot harder for us]. Anyways, so that makes them about 2 years and 2 months old.
The blue shoulder was a member of the other two that we lost. We got them around November 2013. and they were a few months old. He'll probably be 2 months and 7 or 8 months old. Not more.
IF YOU GUYS NEED ANY MORE INFORMATION, OR PICTURES FOR BETTER ADVICE, do let me know. I'll definitely take some.