How Small Can Hummingbirds Be? – Size Range

Hummingbirds, those delightful and enchanting creatures that flit about with astonishing agility, have always fascinated me. But recently, I pondered a question: How small can these remarkable birds be? Curiosity consumed me as I embarked on a quest to explore the size range of hummingbirds.

Regarding size, the Bee Hummingbird (Mellisuga helenae) is the world’s smallest hummingbird species. Found in Cuba, this exquisite bird is a marvel of nature. The Bee Hummingbird measures only about 2.25 inches (5.7 cm) in length and weighs just 0.06 ounces (1.8 grams).

Join me on this journey of discovery as dive into the world of these miniature marvels and uncover the astonishing diversity of sizes that hummingbirds can attain.

The Smallest Hummingbird Species

The smallest hummingbird species is the Bee Hummingbird (Mellisuga helenae). It holds the title for being the smallest bird species in the world. The Bee Hummingbird is endemic to Cuba and measures about 5 to 6 centimeters (2 to 2.4 inches) in length.

The females are slightly larger than the males. These tiny hummingbirds weigh only about 2 to 2.6 grams, which is less than a penny’s weight.

The Bee Hummingbird’s diminutive size allows it to access nectar from very small flowers and feed on tiny insects.

It has iridescent green feathers, and the males have a vibrant red or pink throat patch, which gives them the name “bee” hummingbird due to their small size and the bee-like humming sound they produce during flight.

The small size of the Bee Hummingbird is an adaptation to its unique ecological niche, allowing it to efficiently navigate and feed on the delicate resources available to its tiny size.

Size Range of Common Hummingbird Species

Hummingbird species exhibit a range of sizes, some larger and others smaller. Here’s an overview of the size range of some common hummingbird species:

Bee Hummingbird (Mellisuga helenae)

As mentioned earlier, the Bee Hummingbird is the smallest hummingbird species, measuring about 5 to 6 centimeters (2 to 2.4 inches) in length.

Calliope Hummingbird (Selasphorus calliope)

One of the smallest hummingbird species in North America. It ranges from about 7.6 to 9.1 centimeters (3 to 3.6 inches) in length.

Ruby-throated Hummingbird (Archilochus colubris)

This is one of the most common hummingbird species in eastern North America. It measures around 7.6 to 9 centimeters (3 to 3.5 inches) in length.

Anna’s Hummingbird (Calypte anna)

This species is found along the western coast of North America. It has an average length of about 9 to 10.5 centimeters (3.5 to 4.1 inches).

Black-chinned Hummingbird (Archilochus alexandri)

Found in western North America, the Black-chinned Hummingbird typically measures around 8.9 to 10.2 centimeters (3.5 to 4 inches) in length.

Rufous Hummingbird (Selasphorus rufus)

Rufous species falls within the small to medium size range, measuring approximately 7.6 to 9.1 centimeters (3 to 3.6 inches) in length.

Magnificent Hummingbird (Eugenes fulgens)

This is a larger hummingbird species found in western North America. It has an average length of about 13 to 14 centimeters (5 to 5.5 inches).

Importance of Small Hummingbirds

Small hummingbirds, despite their diminutive size, play a crucial role in ecosystems and serve various important functions. Here are some reasons why small hummingbirds are important:


Hummingbirds are important pollinators, especially for flowers adapted to their small size. As they feed on nectar, their bodies come into contact with the flower’s reproductive structures, allowing for pollination to occur.

They transfer pollen from flower to flower as they move between feeding locations, facilitating plant reproduction and genetic diversity.

Plant Diversity

By pollinating a wide variety of flowers, small hummingbirds contribute to plant diversity and the overall health of ecosystems. They help maintain the balance between different plant species, supporting the reproduction and survival of both common and rare plant species.

Seed Dispersal

Some hummingbirds play a role in seed dispersal. As they visit flowers and consume nectar, they may inadvertently pick up and transport seeds from one location to another.

These seeds can be dropped during their flights or in their droppings, aiding in the dispersal of plants to new areas and contributing to plant colonization and gene flow.

Ecological Interactions

Small hummingbirds are part of the intricate web of ecological interactions within ecosystems. They serve as a food source for predators such as birds of prey, snakes, and larger mammals, contributing to the energy flow and trophic dynamics in their respective food chains.

Ecotourism and Aesthetic Value

Hummingbirds, including the small species, are beloved and admired by many people worldwide. Their vibrant plumage, hovering flight, and unique behaviors make them popular subjects for birdwatching and ecotourism activities.

Can Hummingbirds Fly Upside Down if They are Small?

Hummingbirds flying upside down is a rare phenomenon. While their small size allows for incredible agility, flying upside down requires specific wing adaptations that these birds do not possess. It is believed that their unique wing structure and specialized flight muscles restrict them from performing this acrobatic maneuver.


Hummingbirds, with their incredible diversity and unique adaptations, continue to capture our imagination.

The Bee Hummingbird stands out as the smallest hummingbird species, measuring a mere 2.25 inches in length. However, hummingbirds span a wide range of sizes, each adapted to their specific habitats and ecological niches.

The small size of hummingbirds enables them to perform astonishing aerial feats and feed on nectar from delicate flowers, showcasing their exceptional evolutionary adaptations.

By appreciating the diverse sizes and characteristics of hummingbirds, we gain a deeper understanding of their remarkable nature and the importance of conserving their habitats for future generations to enjoy.



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