Why African greys come up in this conversation
African grey parrots are discussed more often than many species when vets talk about calcium balance, because problems with calcium regulation appear to be a particular vulnerability for them. Calcium matters for muscle control, nerve signals, bone strength, and egg formation, so when levels run low the signs tend to be physical and visible rather than subtle changes in droppings. Diet history matters here: a grey eating mostly sunflower seeds, with little varied food and no access to unfiltered sunlight or vet-advised lighting, is the picture owners most often describe when they ask this question. That background does not prove a diagnosis for any individual bird, but it is exactly what an avian vet will want to know.
The general signs owners report
In general terms, owners may notice fine trembling while the bird is perched, a grip that seems less sure, clumsy landings, or episodes of falling from a perch the bird normally handles easily. Some greys become unsteady, stare blankly for a short spell, chew feathers more, or seem weaker and quieter than usual. More serious episodes can involve muscle twitching, loss of coordination, or a seizure-like event where the bird flutters, cannot perch, and then recovers slowly and looks exhausted. A female that is straining, sitting low, or unable to pass an egg needs urgent care in her own right, whether or not calcium is part of her picture.
What these signs do not prove
Trembling, falls, and weakness are not unique to low calcium. Similar signs can appear with other nutritional gaps, illness, injury from a fall itself, or problems affecting the nerves, heart, or other organs. It would be unsafe to assume calcium is the cause and simply add a supplement at home, because oversupplementing carries its own risks and can delay finding the real problem. A vet assessment, often including an examination and tests the vet chooses for that bird, is the way the cause is sorted out. Your most useful role is accurate observation: when episodes happen, how long they last, what the bird ate that week, and whether there was a fall or fright beforehand.
When this becomes urgent
Contact an avian vet urgently, the same day, if your grey has a seizure-like episode, repeated tremors, a fall with injury, inability to perch, open-beak breathing, or straining consistent with egg trouble. Do not wait to see whether a supplement helps. Keep the bird on a low, padded perch or in a small warm carrier if it is unsteady, remove high toys it could fall from, and avoid handling more than needed after an episode. Tell the clinic what you saw and how long it lasted before you travel, so they can advise you on bringing the bird in safely.
Diet, light, and records to discuss with your vet
At the visit, expect questions about the exact foods eaten, not just offered, any cuttlebone or mineral block use, time outdoors in direct sun through an open window or outside cage, and indoor lighting. Bring that detail written down rather than estimating from memory. Ask the vet to review the overall diet balance for your individual grey rather than focusing on a single nutrient in isolation. Keeping the diet history, weight trend, and exam findings organized in KinsLe Pet Passport makes those follow-up conversations about your grey's calcium and general nutrition much more precise.