What fruits and vegetables can cockatiels eat?

Okay. We have a 5 month old cockatiel named Jynx. He eats seeds and millet spray (treat). We’ve heard they can eat vegetables and fruits, but never tried him on any. So my question is what vegetables and fruits are okay for a cockatiel to eat? What ones will possible kill them? We are going to try him on different ones, so give me lots of choices please.

Thanks in advance!

P.S. Jynx is a male if that matters.

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