Weighing a bird as the earliest sign of illness

Birds have a fast metabolism and limited energy reserves relative to their mass. A reduction in food intake that in a medium sized mammal would produce visible effects over a week translates in a bird into measurable weight loss within one or two days. That speed, which is why birds deteriorate quickly, is also why daily weighing works so well as an alert system.

The catch is that weight only means something against a reference. Knowing that a parrot weighs a certain number of grams today tells you nothing at all: individuals of the same species can differ by a third. What informs you is the distance from that individual bird's usual weight, collected while it was well. Building that baseline costs two weeks of weighing and lasts for the animal's whole life.

No professional instrument is needed. You need a scale with resolution suited to the size of the animal, a surface the bird will stand on for a few seconds, and a tare function so the perch or container can be subtracted.

A perch fixed to the pan is preferable to a closed container for birds used to stepping onto a finger or a stand, because it reduces restraint and keeps weighing a neutral event. For birds not used to handling, a low container with a non slip base and sides high enough to prevent flight remains the safest and quickest option.

A weighing that frightens the animal causes two kinds of damage: a worse figure, because an agitated bird will not stand still, and growing refusal that after a few weeks makes people abandon the routine. Seven days of habituation solve the problem permanently and are the best investment in the whole procedure.

1. 1

   Day one, the scale enters the room

   Put the switched off scale near the cage, in view, and do nothing else. The only aim of day one is for the object to stop being new, and for a bird novelty is in itself a reason for alarm.

2. 2

   Day two, move the scale to the exit point

   Move it beside the spot the bird usually comes out from, still switched off and asking nothing. If it looks at the scale and carries on with its business, this step is done.

3. 3

   Day three, fit the perch and let it explore

   Mount the perch on the pan and let the bird step onto it in its own time, with no deadline and no pressure. Do not weigh yet: the first association has to be neutral or positive, never forced.

4. 4

   Day four, add the reinforcement

   When it steps onto the perch, offer something it likes and does not usually get. Give the reward while it is on the perch, not after it has stepped off, otherwise you reward the wrong moment.

5. 5

   Day five, switch the scale on nearby

   Some scales beep or flash. Switch it on while the bird is close but not on the pan, so the sound loses meaning before it becomes associated with stepping up.

6. 6

   Day six, the first real weighing

   Tare with the perch already fitted, wait for the bird to step up on its own and read the figure as soon as it settles. Do not hold the bird and do not draw it out: a few seconds are enough, and brevity is what makes the routine repeatable.

7. 7

   Day seven, fix the hour and start the series

   From today weighing always happens at the same hour, in the morning, before the first meal. Record the value daily: the first two weeks exist to build the baseline against which everything else will be read.

A bird's weight swings through the day entirely normally: it changes with food eaten, gut contents and hydration. That is why comparing an evening reading with a morning one makes no sense. The protocol exists to strip out those sources of variation, so that what remains is real information.

1. Always weigh in the morning, before the first meal of the day and after the first dropping: it is the most repeatable condition available.
2. Always use the same scale and the same perch: two different setups introduce a fixed offset that looks like a real change.
3. Tare with the perch already fitted, so you read the bird's weight directly with no mental subtraction.
4. Wait two or three seconds for the number to settle before reading it, rather than chasing the initial swing.
5. Record the value immediately, not in the evening: a weight remembered twelve hours later is an invented weight.
6. If the weighing fails because the bird will not cooperate, note that it was not done rather than silently skipping the row.
7. Do not weigh twice to get the number you prefer: if two consecutive readings differ a lot, the problem is the stability of the scale or the bird's position.

Once you have the average of the first fourteen days, every weighing is read as a percentage distance from that value. The percentage matters more than the grams because it makes birds of different sizes comparable and because the useful thresholds live in the percentage.

The most common false alarms all share one origin, a protocol that was not followed. A weighing taken after a meal, a different scale, a wet perch or a bird that has just drunk all produce differences that look like a signal and are not. Before worrying, it is always worth repeating the weighing the next day under proper conditions.

Weighing takes thirty seconds and is the best opportunity for a close daily look. Always checking the same five things, in the same order, builds over time a capacity for comparison no written description can provide.

• The droppings on the tray: amount, the proportion between the solid and liquid parts, colour and any undigested food.
• The plumage: a bird holding its feathers fluffed for long periods, not just briefly, is trying to retain heat.
• The breathing: tail movement with every breath, or open beak breathing at rest, is never normal.
• The stance on the perch: weight on both feet, eyes open and attention to the surroundings is the expected picture.
• Food intake: how much was genuinely eaten compared with yesterday, bearing in mind that many seeds are opened rather than swallowed.
• The usual song or vocalisation: its reduction is often the first change owners recall afterwards.

A consistently recorded weight series is the most useful thing you can hand a vet, because it turns a story into a curve. An owner saying the bird has been eating less for a few days offers an impression; an owner showing fourteen baseline values and six days of decline narrows the differential considerably.

• Record the weight in the animal's profile every day, even when it does not change: the stable days are what give meaning to the ones that move.
• Note in the diary, as a single dated line, abnormal droppings, environmental changes and any change of diet.
• Set a reminder for the weighing at first: after three weeks it becomes a habit and the reminder can go.
• If several birds live together, the weight curve comparison puts their series on the same chart and makes it obvious which one is diverging.
• Before the consultation, prepare the last two weeks of values, the date the change started and any photographs of the cage tray.