yup! no nutrition, your baby is hungry, Sun flowers are an icecream diet, and is not a filling diet. your bird needs bird pellets customized to it, Cockatiel, there are several brands, zupreem, pretty bird and others, you will find them in pet smart, but your bird also needs to eat brown rice, veggies, apples, oranges, be careful with dairy, STAY AWAY FROM AVACADOS, Seeds are kind of emergency oops I can't get to a store just yet type of a thing, sun flower seeds cause fatty livers, and yes your bird has huled the sun flower seeds and taken the meat from it, I suggest you look at the forums top no no on food, and also check out Http://www.birdscomefirst.org
you will find Bill incredibly helpful.
So yes, yooiur bird is hungry, get it on a well balanced died. Becky, myself, and a few others that have parrots are more than happy to answer your questions. why I know is that my birds toss out food when they are hungry and also when the food is stale.