Two full cups are the red lory red flag
Red lories are often offered nectar in more than one place, a cup in the cage and another on a stand, and that generosity is where overfeeding begins. If both cups come back nearly full at change time, day after day, the bird is being presented with far more staple food than it drinks, and the true portion is hidden by the refills. A red lory that needs its nectar does not leave two untouched servings standing.
Reduce the mystery before reducing the bird's dinner. In an overfed red lory's home you will usually find the bird filled the gap with fruit, pollen treats, and licks of whatever sweet item was offered at playtime, so the nectar looked unwanted while total intake stayed high all along.
Freshness limits how much should be served
Nectar spoils quickly, especially in a warm room, and a red lory stirs, bathes near, and backwashes into its cup as it feeds. Brimming cups encourage both waste and overdrinking of a rich mixture simply because it is always there, fresh-looking and within a hop.
Make smaller batches more often rather than one large batch less often. A red lory gets fresher food, you get an honest view of how much it truly drinks, and the discarded remainder shrinks.
Condition in a bird that never sits still
A red lory is a restless, playful, almost kittenish bird, and its constant motion burns real energy, which tempts owners to assume it cannot be overfed. It can. Feel the chest during a quiet moment: the keel should be clearly present under a firm layer of muscle, not padded into a soft mound. A red lory gaining fat may also choose the short hop over the longer flight it used to take between favourite perches, a subtle change worth trusting.
Weigh weekly, using a treat to station the bird on a perch scale before the first feed. Because a lory's weight moves a little with how much liquid it has just drunk, consistency of timing matters more than any one number. A fortnight of rising readings on the same routine is your signal, and it arrives well before the bird's brilliant red outline changes enough to judge by eye.
Extras that layer onto a red lory's nectar
Pollen is a natural and valued part of a red lory's diet, but it is also food, and generous pollen treats across the day count toward the total. Bright, messy, enthusiastic eating makes every offering look well earned.
Give extras an order. Nectar first as the staple, a defined fruit serving as part of the day, and pollen treats tied to training or foraging toys rather than delivered by hand whenever the bird is charming, which for a red lory is continuously. Tuck treats into a paper bundle or under a cup the bird must tip, so the same allowance takes longer and satisfies the urge to work for food.
When a red lory should be checked by a vet
Arrange an avian vet visit if a red lory keeps gaining once nectar amounts and treats are measured, loses its usual bounce, or starts passing droppings that smell sour or look very different for more than a brief spell. A lory that stops drinking its nectar, sits with sticky feathers around the beak, or seems weak needs prompt care, as nectar feeders can go downhill quickly when they stop eating.
Tell the vet the exact nectar recipe, how often batches are changed, and everything else the bird receives, including pollen and fruit from other family members. That full account prevents a simple surplus from being mistaken for illness, and the reverse. At home, protect the routine by recording each fresh batch in KinsLe using Care Teams, where the change is marked done so nobody adds a second serving out of kindness.