Oranges and other citrus fruits are safe for most birds and packed with vitamin C, but their acidity means they are best offered in small amounts.
The short answer
Yes — most birds can eat orange in moderation. The flesh is rich in vitamin C and many birds enjoy the sweet-tart flavour. Because citrus is acidic and sugary, though, too much can upset a small bird's digestion, so keep portions modest.
How to feed orange to your bird
Peel the orange, remove any seeds, and offer a small segment or piece of flesh — breaking the membrane makes it easier for a small beak. A little piece about once a week suits most birds. Skip the peel: it can be bitter and is often sprayed.
Wild birds love citrus too
Halved oranges are a classic way to attract fruit-eating garden birds such as orioles and tanagers, especially in spring. If you put orange halves out for wild birds, use fresh fruit, secure it where it will not attract unwanted pests, and remove it before it spoils.