This could be very bad!!! If you seriously think it is
blood get him/her to a vet immediately!!!
Keep in mind whatever you feed comes out the other end and if
he/she eats strawberries, spagetti etc. then the stool will
be a redish color.
By all means, if you know it's blood call an avian vet right
away. Don't be sorry and pass it off.
Let me know what happens.