Quantity
A budgie weighs roughly 30-40 grams. Even a tiny fragment of dark chocolate — less than you'd think twice about as a human — can contain enough theobromine to be toxic at that body weight. There is no safe amount.
Notes
Dark chocolate and baking chocolate contain the highest concentrations of theobromine, but even white chocolate's high fat and sugar content is harmful to budgies. Cocoa powder is extremely concentrated — a dusting could be dangerous. Hot chocolate, chocolate cake, and chocolate-covered anything all count.
Negative Signs
* Hyperactivity followed by sudden lethargy
* Vomiting or regurgitation
* Diarrhea (possibly dark-colored)
* Rapid or irregular breathing
* Tremors and loss of coordination
* Seizures
FAQ
Q: My budgie nibbled on a chocolate chip cookie crumb. Should I worry?
A: Yes. Even a crumb can be proportionally significant for a 35-gram bird. Call your avian vet and describe what happened — they'll advise based on the type of chocolate and your budgie's size.
Alternatives
Carob is sometimes marketed as a chocolate substitute, but there's really no reason to give your budgie anything chocolate-adjacent. A small piece of banana or a millet spray is a much better treat.
Risks & Disclaimer
If your budgie ate any chocolate, contact an avian vet immediately. Don't try to estimate whether it was "enough" to matter — with a bird this small, any amount is potentially serious. Bring a note of what type of chocolate and roughly how much was eaten.