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.
【Can Birds Eat Rice?】
Many bird owners are having confusions about whether or not to give their pet birds rice in any form. There is a rumor/myth that uncooked rice hits the bird’s tummy and then swells causing its stomach to explode. No worries, rice can NEVER kill a bird, no matter the rice is cooked or raw. For sure, rice cannot be the main food for your birds. You can combine unsalted rice with good-for-birds fruits and veggies so as to let your birds get various nutrition.
Care For Your Birds - Beginners' Guide【新手飼養雀鳥指南】 