What Bird Lays The Smallest Egg In The World?

If you’ve ever marveled at the diversity of birds and their magical ability to lay eggs, you may have wondered: what bird lays the smallest egg in the world? The answer reveals an astonishing feat of nature.

If you’re short on time, here’s a quick answer to your question: The bee hummingbird lays the smallest egg of any known bird, with eggs measuring less than half an inch long.

In this article, we’ll explore the bee hummingbird and its tiny eggs in more detail. We’ll look at how big (or small) the eggs and the bird are, where the species is found, and some key facts about its breeding and reproduction. We’ll also highlight some other birds that lay impressively small eggs.

Get ready for a close look into the minuscule world of the bee hummingbird!

Introducing the Bee Hummingbird

The Bee Hummingbird is a fascinating species of bird that holds the record for laying the smallest egg in the world. Despite its small size, this tiny bird has captured the attention of bird enthusiasts and scientists alike.

Let’s delve into the world of the Bee Hummingbird and discover more about this remarkable creature.

The World’s Smallest Bird

Measuring just 2.25 inches in length and weighing only 0.06 ounces, the Bee Hummingbird is not only the smallest bird in the world, but also the smallest warm-blooded vertebrate species on Earth. Its diminutive size is truly awe-inspiring, considering that its eggs are even smaller.

When it comes to egg size, the Bee Hummingbird lays eggs that are about the size of a pea. These tiny eggs measure approximately 0.4 inches in length and 0.25 inches in width. It’s astonishing to think that such a small bird can produce an even smaller egg!

Where Bee Hummingbirds Live

Bee Hummingbirds are native to the island of Cuba and can be found in a variety of habitats, including forests, gardens, and coastal areas. They are known for their remarkable agility and are often seen darting between flowers, feeding on nectar, and pollinating plants in the process.

If you’re lucky enough to spot a Bee Hummingbird, you’ll most likely find it in the eastern and central regions of Cuba, where it prefers to make its home in dense vegetation and shrubs. These birds are highly territorial, so they can be quite elusive to observe in the wild.

Appearance and Behavior

Despite its small size, the Bee Hummingbird is a vibrant and colorful bird. The males boast a stunning combination of iridescent green feathers on their backs and heads, while their throats shimmer with a deep ruby-red color.

The females, on the other hand, have a more understated appearance, with duller plumage and a white throat.

One of the most remarkable aspects of Bee Hummingbirds is their incredible flying abilities. They are capable of hovering in mid-air, flying backward, and even flying upside down. Their wings beat at an astonishing rate of up to 80 times per second, allowing them to stay suspended in the air while they feed on nectar from flowers.

So, the next time you’re out in nature, keep an eye out for these tiny wonders. The Bee Hummingbird may be small in size, but it certainly leaves a big impression!

Eggs and Reproduction

When it comes to bird reproduction, the process of laying and incubating eggs is a crucial part of their life cycle. Birds have evolved various strategies to ensure the survival of their offspring, including the size and structure of their eggs.

Let’s explore the fascinating world of avian eggs and how different bird species have adapted to this reproductive challenge.

Tiny Eggs

While birds are known for laying eggs, not all eggs are created equal. In fact, the smallest bird egg in the world belongs to the aptly named bee hummingbird (Mellisuga helenae). These tiny birds, found in Cuba and the Isla de la Juventud, produce eggs that measure a mere 0.5 centimeters in length.

To put that into perspective, the bee hummingbird’s egg is about the size of a coffee bean!

But why are bee hummingbird eggs so small? It all comes down to the bird’s size and energy requirements. Bee hummingbirds are the tiniest birds on Earth, weighing only about 2.6 grams. Their small size limits the amount of energy they can store, making it more efficient for them to lay smaller eggs.

Despite their diminutive size, these eggs still contain all the necessary nutrients for the development of the chick.

On the other end of the spectrum, some birds lay eggs that are much larger relative to their body size. For example, the ostrich lays the largest egg of any bird species, weighing around 1.4 kilograms. This size difference highlights the incredible diversity of avian reproduction strategies.

Nesting and Parental Care

Birds have also developed various nesting behaviors and parental care strategies to protect and nurture their eggs. Different species exhibit a wide range of nesting habits, from building intricate nests using twigs and leaves to creating burrows in the ground or using tree cavities.

Once the eggs are laid, many bird species engage in dedicated parental care to ensure the survival of their offspring. For instance, some birds take turns incubating the eggs, with one parent sitting on the nest while the other forages for food.

This cooperative behavior helps maintain an optimal temperature for the developing embryos and ensures that both parents have the opportunity to feed and rest.

Other bird species, such as penguins, form tight-knit colonies where they build nests and share parenting responsibilities. In some cases, both parents actively participate in incubating the eggs and caring for the chicks once they hatch.

It’s important to note that not all bird species invest the same amount of effort in parental care. Some birds, like the cuckoo, have evolved a strategy known as brood parasitism. Instead of building their own nests and caring for their eggs, cuckoos lay their eggs in the nests of other bird species.

The unsuspecting host birds then raise the cuckoo chicks as their own, often at the expense of their own offspring.

Birds’ ability to lay and care for their eggs showcases the incredible diversity and adaptability of these fascinating creatures. Whether it’s the tiny eggs of the bee hummingbird or the elaborate nesting behaviors of penguins, bird reproduction is a marvel worth exploring.

Other Birds with Small Eggs

Vervain Hummingbird

The vervain hummingbird, scientifically known as Mellisuga minima, is a tiny bird species found in Jamaica. While it may not hold the record for the smallest egg in the bird kingdom, it certainly lays eggs that are proportionate to its size.

Vervain hummingbird eggs are about the size of a pea, measuring around 0.4 inches (1 centimeter) in length. These eggs are incredibly delicate and require extra care from the mother bird during incubation.

Cuban Emerald

The Cuban emerald, also known as Chlorostilbon ricordii, is a species of hummingbird native to Cuba and the Bahamas. It is another bird that lays relatively small eggs compared to its body size. The eggs of the Cuban emerald are slightly larger than those of the vervain hummingbird, measuring around 0.6 inches (1.5 centimeters) in length.

Despite their small size, these eggs are vital for the survival and continuation of the species.

Oriental White-eye

The Oriental white-eye, scientifically known as Zosterops palpebrosus, is a small passerine bird found in various parts of Asia. While it may not be as well-known as some other bird species, it is worth mentioning here for its small eggs.

The eggs of the Oriental white-eye are similar in size to those of the Cuban emerald, measuring around 0.6 inches (1.5 centimeters) in length. These tiny eggs play a significant role in the reproduction of the species and the continuation of their lineage.

It is fascinating to observe how different bird species have adapted to lay eggs that are proportionate to their body size. While the smallest egg in the world is laid by the vervain hummingbird, there are other birds, such as the Cuban emerald and Oriental white-eye, that also lay relatively small eggs.

Despite their diminutive size, these eggs are crucial for the survival and propagation of these bird species.

Why Small Eggs?

Have you ever wondered why some birds lay small eggs while others lay large ones? The size of an egg is influenced by various factors, including the bird’s body size, its habitat, and its evolutionary adaptations. Let’s explore the reasons behind the existence of small eggs in the avian world.

Limited by Small Body Size

One of the main reasons why birds lay small eggs is because of their small body size. Smaller birds have limited space within their bodies to produce and carry eggs. As a result, they have evolved to lay smaller eggs that are proportionate to their body size.

This ensures that they can efficiently produce and incubate their eggs without putting excessive strain on their bodies.

For example, the bee hummingbird, known as the smallest bird in the world, lays eggs that are about the size of a pea. This tiny bird, weighing just a few grams, simply cannot produce and carry larger eggs like larger bird species.

Adaptation to Tropical Environments

Another reason for the prevalence of small eggs in certain bird species is their adaptation to tropical environments. In tropical regions, where resources can be scarce and competition for food is high, birds have evolved to lay smaller eggs as a survival strategy.

Smaller eggs require fewer resources to produce and fewer nutrients to sustain the developing embryo. This allows birds in tropical environments to allocate more resources towards their own survival and foraging efforts, increasing their chances of survival in challenging habitats.

For example, the African sunbird, a small bird found in tropical regions of Africa, lays eggs that are significantly smaller than those of its larger counterparts in temperate regions. This adaptation allows the African sunbird to thrive in its challenging tropical habitat.

Understanding the reasons behind the size of bird eggs provides us with fascinating insights into the complexity of nature’s adaptations. Whether limited by body size or shaped by the demands of their environment, birds have evolved to lay eggs that are perfectly suited to their unique circumstances.


The bee hummingbird truly represents the extremes that evolution can produce. By laying the tiniest of eggs, it has found remarkable success, and can thrive even in small island environments. While many factors still mystify scientists, it’s clear that the bee hummingbird has tailored its reproduction precisely to its petite stature.

The next time you see a hummingbird buzzing around, take a moment to appreciate the marvelous diversity of birds. And remember the bee hummingbird – the creator of the world’s smallest egg – living proof that big things can come in small packages.

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