How Much Does A Bird Weigh?

With over 10,000 species of birds in the world, there is an incredible diversity in avian size and weight. From tiny hummingbirds weighing just a few grams to giant ostriches tipping the scales at over 150kg, bird weights vary enormously. But on average, how much does a typical bird weigh?

Read on for a thorough overview of bird weights across different species.

If you’re short on time, here’s a quick answer: Most songbirds like finches and sparrows weigh between 10-60 grams. Larger birds like crows, ravens, and gulls range from 300-1,500 grams. The very largest flighted bird, the Kori Bustard, weighs around 18-19kg.

Typical Weights of Common Bird Groups

Hummingbirds: 2-6 grams

Hummingbirds, known for their small size and incredible flying abilities, are some of the lightest birds in the world. They typically weigh between 2 to 6 grams, which is about the weight of a nickel or a few paperclips.

Their lightweight bodies allow them to hover in mid-air and dart from flower to flower with precision and agility.

Small songbirds: 10-60 grams

Small songbirds, such as finches, sparrows, and warblers, range in weight from 10 to 60 grams. These birds are often found in gardens and forests, singing their beautiful melodies. Despite their small size, these songbirds have powerful voices and can produce a variety of complex songs to communicate with each other.

Pigeons and doves: 100-350 grams

Pigeons and doves, commonly seen in urban areas, weigh between 100 to 350 grams. These birds are known for their cooing sounds and are often associated with love and peace. Pigeons are highly adaptable and can be found in cities all around the world, while doves are often seen as symbols of purity and innocence.

Large corvids: 300-1,500 grams

Large corvids, including crows and ravens, have a weight range of 300 to 1,500 grams. These intelligent birds are known for their problem-solving abilities and complex social behaviors. They are also excellent mimics, capable of imitating human speech and other sounds they hear in their environment.

Big raptors: 1-4 kg

Big raptors, such as eagles, hawks, and owls, can weigh anywhere from 1 to 4 kilograms. These birds of prey have powerful talons and sharp beaks, which they use to catch and consume their prey. They have incredible eyesight and can spot small animals from great distances, making them efficient hunters in the sky.

Ostriches: 90-150 kg

Ostriches, the largest birds on Earth, can weigh between 90 to 150 kilograms. These flightless birds are native to Africa and are known for their strong legs, long necks, and distinctive feathers. Despite their inability to fly, ostriches are incredibly fast runners and can reach speeds of up to 70 kilometers per hour.

Factors Impacting Bird Weight

When it comes to bird weight, several factors come into play. These factors can vary greatly depending on the species, age and gender, habitat and diet, as well as seasonal variation.


One of the most significant factors impacting bird weight is the species itself. Different bird species have different average weights. For example, a bald eagle weighs on average around 10-14 pounds, while a hummingbird weighs only a few grams.

The size, body structure, and lifestyle of each species contribute to their varying weights.

Age and Gender

The age and gender of a bird also play a role in determining its weight. Just like humans, birds go through growth and development stages. Younger birds tend to be lighter as they are still growing and developing their muscles and feathers.

Additionally, there may be weight differences between males and females of the same species, with males sometimes being slightly larger and heavier.

Habitat and Diet

The habitat and diet of a bird are crucial factors impacting its weight. Birds living in different environments may have access to different food sources, which can directly affect their weight. For example, birds living in urban areas may have a more diverse diet due to the availability of human-provided food, which could result in variations in weight compared to their counterparts in rural areas.

Additionally, birds with access to abundant food resources may be heavier than those with limited food options.

Seasonal Variation

Seasonal variation can also impact bird weight. Some bird species undergo seasonal migrations, during which they may lose weight due to the long-distance flights and limited food availability. On the other hand, during breeding seasons, birds may gain weight to support the energy-intensive activities associated with reproduction, such as nest building and incubation.

These fluctuations in weight throughout the year are natural and essential for the survival and reproductive success of birds.

Understanding the factors impacting bird weight helps researchers and bird enthusiasts gain insights into the biology, ecology, and behavior of these fascinating creatures. By studying these factors, we can better appreciate the incredible diversity and adaptability of birds in our natural world.

Measuring Bird Weight Accurately

When it comes to understanding the weight of birds, there are several methods that can be used to measure their weight accurately. These methods include using scales, estimating weight based on size, and weighing trapped wild birds.

Using scales

One of the most accurate ways to measure the weight of a bird is by using specialized bird scales. These scales are designed to be gentle and non-intrusive, ensuring the bird’s safety during the weighing process.

Bird scales are commonly used by researchers, bird enthusiasts, and veterinarians to gather important data on bird health, growth, and migration patterns. By measuring a bird’s weight regularly, scientists can monitor changes in weight that may indicate changes in diet, habitat, or overall health.

Estimating weight based on size

If you don’t have access to a specialized bird scale, another method to estimate a bird’s weight is by using its size as a reference. Different bird species have varying body structures and sizes, which can provide clues about their weight.

For example, larger birds like eagles and owls are generally heavier than smaller birds like sparrows and finches. While this method is not as accurate as using scales, it can still give you a rough estimate of a bird’s weight.

Weighing trapped wild birds

In some cases, capturing and weighing wild birds may be necessary to obtain accurate weight measurements. This method is commonly used by ornithologists and researchers who study bird populations and their behaviors.

When trapping a bird, it is essential to use humane and ethical methods to minimize stress and harm to the bird. Once trapped, the bird’s weight can be measured using a scale or other weighing device. This data can provide valuable insights into the health and condition of wild bird populations.

It is important to note that the weight of a bird can vary depending on factors such as age, sex, and breeding season. Therefore, it is essential to consider these factors when interpreting weight measurements.

Additionally, it is always a good idea to consult reliable sources such as scientific journals, birding organizations, and wildlife conservation websites for more detailed information on bird weight and measurement techniques.

Why Bird Weight Matters

Bird weight is an important metric that holds significance in various aspects of avian research and conservation. Understanding the weight of birds allows researchers to gather valuable insights into their overall health, behavior, and ecological roles. Here are some reasons why bird weight matters:

1. Tracking health status

Monitoring the weight of birds can provide valuable insights into their health status. Weight loss or gain can indicate various health conditions such as malnutrition, disease, or reproductive issues. By regularly tracking the weight of individual birds or populations, researchers can identify potential health problems and take necessary actions to mitigate them.

This helps in the conservation and management of bird species.

2. Dosing medications

Accurate dosing of medications is crucial for the well-being of birds under veterinary care. The weight of a bird determines the appropriate dosage of medications, including anesthesia, painkillers, or antibiotics.

Administering incorrect dosages can have detrimental effects on bird health and potentially compromise their recovery. Therefore, knowing the weight of a bird is essential for providing optimal medical care.

3. Understanding migration capacity

Bird weight plays a significant role in understanding their migration patterns and capacity. During migration, birds rely on their energy reserves to fuel their long-distance flights. By studying the weight of migratory birds before and after their journeys, researchers can gain insights into their energy expenditure, foraging strategies, and even predict potential stopover sites.

This information helps in the conservation of important migration corridors and habitats.

4. Analyzing extinction risks

The weight of bird species can also contribute to assessing their vulnerability to extinction. Birds with larger body sizes generally have lower reproductive rates and longer generation times, making them more susceptible to environmental changes and habitat loss.

By analyzing the weight distribution across different bird species and populations, researchers can better understand the potential risks of extinction and prioritize conservation efforts accordingly.


From just a few grams for the tiniest hummingbirds to over 100 kilograms for the largest ostriches, bird weights are amazingly diverse. Factors like species, age, habitat, and season all impact avian weights.

Carefully weighing birds allows researchers to assess health, establish medications, study migration capacity, and more. So while birds may be feather-light, their weights reveal much about their lives.

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