Hypocalcemia (low blood calcium) is one of the most serious and life-threatening conditions in African grey parrots, and it occurs at far higher rates in this species than in other companion parrots. Seizures, tremors, and sudden weakness can appear without warning — and African greys are often kept on calcium-poor all-seed diets that make the problem far worse.
Last reviewed: June 2026
Why African Grey Parrots Are Uniquely Prone to Hypocalcemia
African grey parrots (Psittacus erithacus) have a well-documented tendency to develop hypocalcemia compared to other psittacines, as detailed in Carpenter's Exotic Animal Formulary. Leading hypotheses include impaired parathyroid gland function and a species-level susceptibility to vitamin D3 deficiency that reduces calcium absorption.
Many African greys are fed all-seed or high-sunflower-seed diets inherently low in calcium and vitamin D3. Without UV-B light exposure (which companion birds rarely receive indoors) or dietary vitamin D3, even moderate calcium intake may not be bioavailable — resulting in blood calcium that can drop to dangerous levels without warning.
Signs of Hypocalcemia in Parrots
Clinical signs of acute hypocalcemia in African grey parrots range from subtle to dramatic:
- Seizures — the most alarming presentation; sudden loss of consciousness or uncontrolled muscle jerking
- Muscle tremors or twitching — especially of the legs or wings
- Ataxia (incoordination) — stumbling, falling off the perch, inability to grip
- Weakness or collapse — the bird may be found on the cage floor, unable to right itself
- Hypersensitivity to stimuli — startles easily, reacts strongly to touch or noise
- Biting or unusual aggression related to neurological irritability
Between acute episodes, some African greys show milder chronic signs: slight clumsiness, falling off perches at night (a well-known presentation called "night frights" in this species), or intermittent leg weakness (AAV Basic Care for Companion Birds, 2019).
Diagnosis and Treatment
Diagnosis is confirmed by serum ionized calcium measurement — total calcium can be misleading as it is partly protein-bound. African greys with ionized calcium below approximately 0.8–0.9 mmol/L are at high risk for clinical signs.
Emergency treatment for a seizing bird involves:
- IV or IM calcium gluconate — administered slowly under monitoring; rapid injection can cause fatal cardiac arrhythmia
- Seizure management — diazepam for active seizures
- Supportive care — warmth, oxygen, fluid support
- Long-term management — conversion to a calcium-rich, varied diet (dark leafy greens, pellets, and limited seed); daily vitamin D3 supplementation; and ideally access to natural or UV-B lamp lighting
If the seizure is the first presentation, bloodwork including full chemistry and CBC is essential to rule out other causes (heavy metal toxicity, infection, nutritional deficiencies beyond calcium).
When to See a Vet
Call your vet today if:
- Your African grey has had any tremors, twitching, or episodes of falling off the perch
- The bird appears uncoordinated, stumbles, or struggles to grip
- You notice intermittent weakness in the legs
- Diet history includes primarily seeds or sunflower seeds and no vitamin D3 supplementation
- Your African grey has a history of previous hypocalcemic episodes
Go to the ER immediately if:
- Your parrot is having a seizure — uncontrolled muscle jerking or loss of consciousness
- The bird is collapsed on the cage floor, unresponsive, or unable to move
- Seizure activity has lasted more than 2 minutes or recurred within the same hour
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Frequently Asked Questions
Why are African grey parrots so much more likely to get hypocalcemia than other parrots? African grey parrots appear to have species-specific impairment in calcium regulation, possibly involving the parathyroid glands or their response to parathyroid hormone. Combined with the all-seed diets common in companion bird keeping and limited UV-B exposure indoors, this creates a perfect storm for dangerously low blood calcium. Other parrot species can develop hypocalcemia but far less frequently.
What do parrot seizures from low calcium look like? A calcium-deficiency seizure in an African grey typically involves sudden loss of balance, falling from the perch, uncontrolled leg or wing twitching, and momentary loss of consciousness. The bird may call out, flap wildly, and then become limp. Episodes usually last 30–90 seconds. After the seizure, the bird may appear dazed and weak for several minutes. These episodes are a veterinary emergency.
How much does treating African grey hypocalcemia cost? An emergency avian vet visit runs $150–300. Bloodwork including ionized calcium typically costs $150–300. Emergency calcium treatment and hospitalization for a seizing bird commonly reaches $500–1,200. Ongoing management — diet conversion, UV-B lighting, supplements — is inexpensive by comparison: $30–80 per month in supplements and $100–250 for a quality UV-B lamp that lasts 1–2 years.
What should I feed my African grey to prevent hypocalcemia? Transition your African grey to a diet that is 60–70% high-quality pellets (which contain formulated calcium and vitamin D3), supplemented with dark leafy greens (kale, bok choy, turnip greens), and limited seed. Avoid all-seed diets. Ensure UV-B lighting via natural unfiltered sunlight or a reptile-appropriate UV-B lamp 10–12 hours per day. Discuss specific supplementation needs with your avian vet.
Can African grey hypocalcemia be cured permanently? African greys can live seizure-free for years with proper diet, UV-B exposure, and supplementation — but the underlying species predisposition does not go away. Regular monitoring via annual bloodwork (including ionized calcium) is recommended for life. Birds that have had one hypocalcemic episode are at risk of recurrence if management lapses.
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