multipleIs it on multiple nails or just the one? It could be dirt on the nail, or just how the nail is colored.
And is it in the same spot on each toe? I'm not sure so I'm not going to say anything, Someone's already tagged @Zara but I know she can help better than me.multiple
**When bringing home a lovebird, it is important to have them tested for PBFD, Psittacosis and Polyoma by your avian vet.