Can cockatiels eat coconut?

Yes, in small amounts

Yes, but only a small piece, rarely. Coconut is not toxic to cockatiels, but its high fat content is a concern for a species prone to obesity and fatty liver disease.

Portion: A sliver about 1 cm (⅜ in) across
How often: Once a week at most
Sugar: 6.2 g / 100 g
Fat: 33.5 g / 100 g

How to serve it

Offer fresh, unsweetened coconut only
Skip desiccated, sweetened or oil-based coconut products
Cut a thin sliver
Take away leftovers after a couple of hours

Why

Risks. High fat. VCA lists cockatiels among the birds most commonly affected by obesity, and Merck associates obesity with fatty liver disease.

Benefits. A little fresh coconut can be used as a foraging reward.

Questions owners ask 1

Is coconut shell safe as a toy for cockatiels?

Clean, dry coconut shell is commonly used for toys. Make sure it contains no moldy flesh, glue or sharp edges.

Coconut: nutrition per 100 g

Water	47 g
Energy	354 kcal
Sugars	6.2 g
Fat	33.5 g
Protein	3.3 g
Fibre	9 g
Calcium	14 mg
Phosphorus	113 mg
Calcium : phosphorus	0.12 : 1
Sodium	20 mg
Vitamin A (RAE)	0 µg
Vitamin C	3.3 mg

“Nuts, coconut meat, raw”, USDA FoodData Central (SR Legacy, FDC 170169). Public domain.

Sources & method 3

The sources below discuss coconut for cockatiels (or for pet birds generally). Confidence: medium. Rated on the JOMIZOO Feeding Scale; when good sources disagree we choose the more cautious level.