Quote Originally Posted by crazy_caique
your females did the wolf call?I have never heard of a female doing that?
Both females and males can do the wolf whistle as well as imitate human speech. It's just a common misconception that female birds are less talented in the speech department. On the contrary, females are calmer and, in some cases, more willing to please and easier to train than their bouncy male counterparts.

Like it was mentioned above, eggs and sex-testing (via endoscopy or DNA testing with a feather/blood sample) are the only 100% ways to tell a bird's gender. Since cockatiels have various mutations, you can never really tell a bird's gender through visual characteristics. Assuming most pet cockatiels sold in pet stores are Normal Grays, however, it looks like Spike is most likely a female. Although she is gaining a lot of brighter yellow, her color points predominantly to females.

Does Spike like any yogurt treats or plain millet seed? You can sprinkle a few teaspoons of millet seed in your hand before feeding breakfast. She should be hungry enough by now to accept food directly from your hand. Just try to be patient. Things will turn around soon enough. Have you bought Guide to a Well-Behaved Parrot by Mattie Sue Athan? It really is an excellent guide