Birds
Birds have extremely fast metabolisms and air-sac respiratory systems, making them acutely sensitive to avocado (persin), caffeine, and chocolate.
6 foods reviewed for Birds
Toxicology Profile
Persin Cardiotoxicity
Avocado contains persin, a fungicidal toxin that causes myocardial necrosis (heart-muscle death) and respiratory distress in birds. Even a small bite can be fatal within 24–48 hours.
Air-Sac Vulnerability
Birds breathe with a continuous-flow system involving air sacs that concentrates airborne compounds — including vapors from overheated non-stick pans (PTFE) and fumes from cooking onions — far more than mammalian lungs.
High Metabolic Rate
A bird's resting metabolic rate is 2–4× higher than similarly sized mammals. Toxic thresholds are reached at much lower absolute doses, making even brief exposures potentially lethal.
All 6 Reviewed Foods
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Clear FiltersAvocado
Avocado is toxic to birds. The persin in the fruit, skin, pit and leaves can cause sudden heart and breathing failure, and pet birds are extremely sensitive.
Raisins
Raisins pose a serious toxic risk to birds and should never be offered as a treat or food supplement. While the exact mechanism in avian species is not as thoroughly documented as in dogs, raisins contain concentrated compounds — including high sugar loads, possible mycotoxins, and an unidentified nephrotoxic principle — that can overwhelm a bird's extremely sensitive and small-volume metabolic systems. Avian veterinarians consistently advise against feeding any grape-derived product, including raisins, to pet or wild birds.