How to get my parakeet to drink more water?

Blueberries, cherries and cranberries can turn fecal matter black. Birds on a seed-only diet pass dry and sticky or pasty-looking greenish-black feces, a reflection of malnourishment that eventually can lead to disease. If he is not eating fresh veggies and fruits- he should really be on a pelleted diet. There are all kinds out there in case you're worried about organic food. Also- another reason the poop might be black is that there is bleeding- blood found throughout the stool usually means the bird is bleeding from the lower intestinal tract. It can be a symptom of intestinal infections, poisoning, warts, tumors, ingestion of foreign objects such as parts of toys, parasites, problems with egg laying or even eating cuttlebone or mineral blocks. Lack of urine is serious- it could mean your bird is dehydrated, which could quickly lead to death. Take your little guy to the avian vet if at all possible.