I believe most people already know that birds are absolutely not allowed to eat onions and garlic. But why? Take a look.
【Can Birds Eat Celery?】
Celery is a vegetable that birds can eat. Celery contains rich nutrients such as vitamins A, C, and K. Although celery is safe for birds, celery stringy part (fiber) are unsafe to birds. If birds eat the stringy part, it can cause crop impaction or constipation, so you must remove the celery stringy part before feeding birds. Meantime, keep in mind that vegetables must be thoroughly washed before giving to birds.
【Can Birds Eat Peanuts?】
Peanuts are rich in protein and vitamin E, they even have some “healthy” fats. Although birds can eat peanuts (cooked/roasted and no-salt), it is not recommended to feed too much to birds because peanuts contain aflatoxin. Eating too much aflatoxin can increase the incidence of liver cancer.
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Care For Your Birds - Beginners' Guide【新手飼養雀鳥指南】 