Leena Watts
Birds are known to change their diets seasonally, with their food choices driven by availability and nutritional needs. For instance, during the summer, birds benefit from a more varied diet, including extra protein and calcium, which supports breeding and chick growth. In preparation for migration, they increase their consumption of high-energy foods like berries and insects, gaining weight to fuel their journey. This phenomenon is known as hyperphagia. Bird diets in autumn are typically high in fat, sugar, and calories, helping them build up weight for the winter. Additionally, birds that do not migrate may alter their feeding habits as winter approaches, caching food instead of eating it immediately. Understanding these dietary changes can help birders adapt their feeding strategies to cater to the changing needs of wild birds.
| Characteristics | Values |
|---|---|
| Diet change reasons | Food availability, nutritional needs, migration |
| Diet change factors | Seasonality, breeding, molting, mating |
| Dietary needs | Protein, Calcium, Vitamins, Minerals, Amino Acids, fat, Calories |
| Dietary sources | Insects, seeds, fruits, natural foods, pellets |
| Diet transition tips | Gradual change, monitor intake, observe behavior |
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What You'll Learn
Migration weight gain
Migration is a perilous journey for birds, and they undergo extreme feats to prepare for it. One such feat is the accumulation of fat to fuel their flights. During migration, birds require high-fat stores, and the ability to manage their energy supply by using stores acquired at stopovers is crucial.
Birds eat excessive amounts of food for two weeks or more to store fat before migration. They gorge on high-energy berries, fruits, seeds, and bugs loaded with carbohydrates and lipids, which are stored as fat. This process is called hyperphagia, and it is when birds undergo organ transformation. Their digestive tract expands to process more food, and they quickly shrink and re-absorb parts of the same system during migration as they burn fat. This keeps energy focused on the most important flight muscles, reducing the need for frequent fueling at stopover sites.
Fat is lighter and less bulky than carbohydrates and protein, which is essential for lightweight, small-framed bodies that must stay aloft by wingbeat. It is also more energy-efficient than carbohydrates, which is crucial for long-distance flights. Birds can replenish fat by taking breaks to refuel during their migration.
Some birds, like the Ruby-throated Hummingbird, double their body weight in fat before migrating. The Blackpoll Warbler also nearly doubles its weight by gorging on berries and sugar-rich aphids in late summer and early fall as it prepares for migration. The Bar-tailed Godwit, which flies 6,800 miles non-stop from Alaska to New Zealand each fall, absorbs 25% of the tissue comprising its liver, kidneys, and digestive tract to make room for energy-rich fat.
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Seasonal food availability
Birds' diets are influenced by the seasonal availability of food sources, with their eating habits changing to match what is available. This is similar to how humans change their diets from fresh spring berries to summer barbecues and then to autumn and winter roasts.
In spring and summer, insectivorous birds feed on the abundance of insects, which are also a source of food for chicks. In summer, birds also eat seeds, which continue to be available in autumn, along with fruits, which are essential for many herbivorous and omnivorous species. In winter, birds eat high-energy foods like seeds, suet, and nuts to survive when food is scarce.
Some birds migrate when food sources diminish, flying towards the equator or warmer climates where food is more plentiful. Migratory birds require high-energy, high-protein, and low-fat foods to fuel their long flights. Their bellies increase in size, and their digestive systems shut down so that they can eat more and store energy for migration. They may also adjust their migration routes based on seasonal food sources. For example, the rufous hummingbird migrates from Mexico to Alaska in the spring, taking a coastal route where flowers are blooming due to the warmer waters of the Pacific Ocean. In the fall, it migrates south through the mountains, where late-season flowers are still blooming.
Birds' foraging strategies also change with the seasons. They may use tools, such as sticks, or employ clever predator avoidance tactics to navigate diverse environments and compete for food.
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Nutritional requirements
A balanced diet, also referred to as a complete diet, is ideal for companion birds. This typically includes a combination of nutrients tailored to the bird's specific needs. Commercially formulated foods, such as pellets, extruded diets, whole grains, and seeds with added pelleted material, are popular options for bird owners. Pelleted diets, in particular, have gained popularity as they provide a better-balanced diet without the need for additional vitamin and mineral supplements. However, not all birds will readily accept pelleted food, and some species, like certain canaries and finches, require seeds as their primary diet.
It is important to note that a seed-only diet is often insufficient, as it may lack essential nutrients and can be too high in fat. Additionally, vitamins and minerals coated on the outside of seeds can be lost during dehulling, creating a nutritional imbalance. Therefore, birds on a seed-based diet should receive daily supplements containing vitamins, including Vitamin D3, and minerals such as calcium, iodine, and amino acids. These supplements can be provided in powdered form, but they should be sprinkled on fresh produce or pellets rather than seeds or water to avoid waste and potential bacterial growth.
Minerals are another crucial component of a bird's diet and can be supplied in the form of cuttlebones, mineral blocks, oyster shells, or egg shells. Micro-minerals, such as iron, zinc, copper, manganese, iodine, and selenium, are required in smaller amounts but are just as important for the bird's overall health.
The nutritional requirements of birds also vary seasonally, affecting the food they eat. For example, during migration in spring and fall, birds require more fat and calories to fuel their journeys. They consume high-energy berries and fruits and other high-calorie foods to gain weight. In contrast, during the summer months, a more varied diet is beneficial, especially with extra sources of protein and calcium, to support breeding and chick development.
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Dietary supplements
Birds that are on a seed-based diet should be given a daily supplement containing vitamins, minerals, and amino acids. Powdered vitamin formulations are best when sprinkled on fresh produce or pellets. When sprinkled on seeds, most of the powder is wasted, and when put in the water, vitamins can encourage harmful bacterial growth.
Minerals are essential and should be supplied daily in the form of cuttlebones, mineral blocks, oyster shells, or eggshells. Calcium is the most important mineral for birds, and it is needed for strong bone formation, blood clotting, feather growth, and healthy eggs. Calcium supplements can be added to a bird's food or water, but it is hard for birds to absorb. Therefore, it is recommended that birds are given vitamin D3 alongside calcium to help their bodies absorb it.
Vitamin A is the most common vitamin deficiency seen in pet birds. It is an important skin vitamin that helps with the health of the eyes, feathers, reproductive system, and immune system. Other vitamins that are important for birds include vitamin E, B-complex vitamins, and vitamin D3. B-complex vitamins should be given daily as they are continually excreted from the body.
Birds will also benefit from balanced fatty acids, such as Omega-3 and Omega-6, which assist the immune system and the body's ability to respond to disease.
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Transitioning diets
Understanding Nutritional Needs
Bird diets should be tailored to their specific needs. For example, during the summer months, wild birds benefit from a varied diet rich in protein and calcium to support breeding and chick development. In contrast, during migration and winter, they require extra fat and calories to endure long journeys and cold nights.
Gradual Transition
When introducing new foods to your bird's diet, a gradual transition is key. Avoid sudden changes, as they can cause digestive issues. Instead, offer a mixture of old and new foods, gradually increasing the proportion of new food over 7 to 10 days until they are fully accustomed to the new diet. This process may take time and patience, especially if your bird is used to a seed-based diet.
Monitoring Food Intake
It is crucial to monitor your bird's food intake during the transition. Birds may appear to be eating the new food but could be searching for their old diet. Regularly weigh your bird and observe physical signs of poor consumption, such as weight loss, listlessness, fluffed feathers, or loose droppings. If these signs persist, revert to the old diet for a week and seek veterinary advice if necessary.
Balanced Diet
Ensure your bird's diet is balanced and complete. A pelleted diet can provide the bulk (60-80%) of their nutritional needs, with brands like Harrison's offering organic, preservative-free options. To enhance their diet, offer a variety of fresh foods, including natural fruit juices and whole fruits, as birds have a poor sense of smell and taste and are attracted to appearance and texture.
Seasonal and Migration Adjustments
Birds' diets also change with the seasons and during migration. In autumn, they may feed more frantically, driven by hyperphagia, a hormonal change that leads them to overeat and gain weight for migration. Adapt your feeding strategy by offering natural foods like seeds, grains, and ripe fruits, and ensure a constant supply of water.
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Frequently asked questions
Birds change their diet in the fall by eating more high-energy foods, such as seeds and grains from grasses and flowers, berries, and bugs, to build up their body weight and store fat as fuel for migration.
In the summer, birds eat a more varied diet, including protein-rich insects. They also eat calcium-rich foods to support healthy breeding through strong eggshells.
During the peak of migration in spring, birds eat more sugars, fruits, nectars, and other high-calorie foods to gain weight. They also require extra protein to grow strong, supple feathers for efficient flight.
It is important to introduce new foods gradually. Start by mixing small quantities of new food with their current food and slowly increase the amount of new food over a 7 to 10 day period.
