...Or are the birds in both species almost the same size?
I noticed that the diluted green fischer's lovebird I purchased as a mate for my normal green fischer's is smaller. The pet store owner assured me the diluted is old enough to be with her but still he is still smaller. He is long but his beak is smaller and he is thinner. Does this just mean he is younger and overtime he may get bigger with a proper diet and vitamins? Or are the diluted smaller in size than the normal green?
Answer on Are Diluted Green Fischer's Lovebirds a smaller species than the Normal Green Fischer's...?
They're the same species. It works like people with different colored hair. And like people, lovebirds come in varying sizes, whether they're dilute green or not.
Lovebirds are full sized once they're weaned. He may bulk up some if he's currently underweight.