A word of caution, if you feed any pellets at all, feeding citrus fruits is a big no-no.
Apple seeds contain cyanide and are very toxic. I would never let my birds get ahold of one. If I don't know for sure, I just remove all seeds.
This is copied off an article found here:
http://birds.about.com/od/feeding/tp/poisonousfoods.htm
Quote:
2) Apple Seeds
Believe it or not, apples - along with other members of the rose family including cherries, peaches, apricots, and pears - contain trace amounts of Cyanide within their seeds. While the fruit of the apple is fine for your bird, be aware that in addition to the poisonous seeds, there may be pesticides present on the fruit's skin. Be sure to thoroughly cleanse and core any apple pieces that you share with your bird to avoid exposure to these toxins.
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I haven't heard about mango and papaya seeds being toxic- I'll try to look around to find that answer.