Weight Management in Falconry: A Delicate Balance

By Supporting British Birds of Prey in the Wild
Comments 35
15 Jul 2026

Weight Management in Falconry: A Delicate Balance

Why Flying Weight Matters

In falconry, weight is not simply a number on a scale. It is the key that unlocks a bird's willingness to work with you. A hawk or falcon that is too heavy may ignore the lure, fly off, or sit in a tree. One that is too light may be weak, reluctant, or vulnerable to illness. The aim is to find the bird's flying weight: the narrow range where it is keen, responsive, and still in full health. This range is personal. A bird's ideal flying weight can change with age, season, moult, weather, and fitness. Managing it well is a daily conversation between falconer and bird.

Condition Is More Than a Number

Two birds of the same species can weigh exactly the same and be in very different condition. A large female peregrine at 900 grammes might be lean and ready to fly; a smaller female at 900 grammes might be carrying excess fat. This is why experienced falconers talk about condition as much as weight. Condition describes the bird's muscle tone, breast shape, feather quality, and overall alertness. Weight is a useful guide, but it must be read alongside what your hands and eyes tell you. Keep a written record of both. A diary of daily weights, food intake, weather, and behaviour will reveal patterns that a single weighing cannot.

Weighing Your Bird Every Day

Daily weighing is the foundation of safe weight management. Use a reliable digital scale that measures in grammes and is accurate to within a gramme or two. Weigh at the same time each day, ideally first thing in the morning before feeding and after the bird has cast. A bird's weight can fluctuate by 10–20 grammes simply because of a full crop, a pellet, or a drink. Consistency matters. Record the weight immediately, along with the time and any notes. If you miss a day, do not guess. Weigh again before making any change to the ration.

Use the same scale and the same perch or weighing station each time.
Weigh before the first meal of the day, not after.
Note the weather: cold, wet, and windy days burn more calories.
Keep a simple notebook or chart; patterns matter more than single readings.

Reading the Keel and Pectoral Muscles

The keel is the bony ridge running down the centre of the bird's breast. In a bird at a healthy flying weight, the keel should be easy to feel but not sharp. The pectoral muscles on either side should feel full and rounded, like a well-toned athlete's thigh. If the keel feels like a knife edge and the muscles are sunken, the bird is too thin. If you cannot feel the keel at all because of a thick layer of fat, the bird is too heavy. Check condition every day, not just when you weigh. A bird can lose muscle quickly if it is flown too light or fed poorly. Muscle loss is a serious warning sign. Stop, feed a sensible ration, and seek advice.

Adjusting Rations with Care

When you need to change a bird's weight, do it slowly. A crash diet is dangerous. Aim to shift no more than about 5–10% of body weight over a week, and make changes in small steps. If your bird is 30 grammes above its flying weight, reduce the daily ration by 10–15 grammes and monitor. If it is below, increase by a similar amount. Feed a varied diet of good quality: day-old chicks, quail, rabbit, rat, or pheasant. Variety supports health, but consistency in quantity is what controls weight. Never withhold food to the point of starvation. A hungry bird is not a trained bird; it is a bird in distress. If you are unsure, feed a small meal and ask an experienced falconer for help.

When Weight Control Goes Wrong

Problems usually appear as behaviour changes first. A bird that is too high may scream, bate, or refuse to come to the lure. A bird that is too low may sit hunched, shiver, or fail to chase. Both situations need immediate attention. Low weight can lead to hypothermia, poor feather growth, infections, and organ damage. If your bird is wet and cold and below its flying weight, do not fly it. Warm it, feed it, and let it rest. High weight is less immediately dangerous, but it risks loss of the bird. If a hawk flies off, it may not survive. In the UK, the Animal Welfare Act 2006 places a duty on keepers to meet their birds' needs. That includes proper weight management. When in doubt, consult a vet with avian experience or a trusted falconer. Your bird's condition is the best guide you have. Learn to read it, record it, and respect it.

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5 Comments

Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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