Grrrr.... How exactly is used the talking bird from the 1st island lighthouse?
 

Well, as the topic says. She eats wanderer scrolls but for 250 fights created only 1 scroll when asked. Also it is never hungry when i ask (always munching some worm)

I do not know the exact formula but I think different scrolls take longer but what I gathered is this is pretty much how it works. First the bird can only make one scroll by itself when you first get it. You have to ask it too make one which then I think takes X amount of fights depending on the scroll you ask it too make. Now when you acquire a new scroll you have to give the scroll to the bird and give it time to read it (which this takes a few fights usually) so it can learn it then after that it can infinitely make them for you. It will take the first scroll from you and then you can turn around and ask it again in a couple fights to make that scroll for you. Also it seems it took 5 crystals each time it wanted to make a scroll I am not sure if it requires a different amount for different scrolls but I know I asked it one time and I did not have any magic crystals so it told me it needed 5 magic crystals to make the current scroll.

Now the food part was what I did not fully understand I am not sure if feeding it makes it work faster or makes it ready to create one right away. I think you have to feed it after every scroll it creates or it will not give you the dialogue to make the next scroll you want it too make.(don't quote me on this I could be wrong) I know that its not always hungry but I just fed it every time I could when I was trying to get it to do something. The food I fed it was thorn sprouts and one other thing I do not remember right off hand. I do not remember cause I only had a small supply of the second thing i was feeding it so it was pretty much always thorn sprouts which I do not know if it matters what you feed it just as long as you do feed it.

So that is about the best I gathered how it works after messing with it for about half the game trying to figure out what it does and how to get it to do things.