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Hummingbird hawk-moth

life science Maturity 7-9 Next article →

The hummingbird hawk-moth, known scientifically as Macroglossum stellatarum, is a remarkable insect from the hawk moth family, Sphingidae.

Macroglossum stellatarum on flowers - nectaring process
Macroglossum stellatarum on flowers - nectaring process

It is widely recognized for its striking resemblance to hummingbirds. This similarity is a classic example of convergent evolution. This occurs when different species develop similar traits to solve the same environmental challenges. Much like the birds they resemble, these moths hover in mid-air while feeding on nectar. They use a long, specialized feeding tube called a proboscis to reach deep into flowers. This unique way of life allows them to thrive in many temperate regions across Eurasia.

Feeding requires incredible physical precision and energy. The moth utilizes free hovering flight to maintain control while it feeds. This type of flight allows for high maneuverability, though it comes at a high energetic cost. To stay balanced, the moth relies on Johnston's organs for body positioning information. As they hover, their rapid wing movements create an audible humming noise.

Macroglossum stellatarum on flowers - nectaring process
Macroglossum stellatarum on flowers - nectaring process

The moth specifically targets flowers with tube-shaped corollae, such as honeysuckle or Buddleia. Because their proboscis is so long, they can access nectar that other insects cannot reach. This helps them avoid competition for food. Some researchers believe the length of their proboscis evolved specifically to match the length of these flower tubes.

The life cycle of the hummingbird hawk-moth involves several distinct stages. It begins when a female lays glossy, pale green, spherical eggs on host plants like Galium. These eggs are camouflaged to look like flower buds. A single female may lay up to 200 eggs, placing each one on a separate plant. The eggs hatch within 6 to 8 days. The newly hatched larvae are clear yellow, but they quickly change color. By the second instar, they become green with grey stripes bordered in cream.

Sphingidae - Macroglossum stellatarum - Habitat
Sphingidae - Macroglossum stellatarum - Habitat

These larvae feature a characteristic horn on their rear end. In the final instar, this horn turns blue with an orange tip.

After the larval stage, the insect enters the pupal stage. The pupae are pale brownish and possess a prominent, keeled proboscis. They also have two sharp spines at the end of the cremaster, a structure used for attachment. These pupae are protected inside loose silken cocoons. These cocoons are often found among leaf litter or host plant debris on the ground. The transition from pupa to adult allows the moth to begin its active, flying life. Once they emerge as adults, they possess brown forewings with black wavy lines and orange hindwings with black edges.

Distribution map Macroglossum stellatarum
Distribution map Macroglossum stellatarum

The history of this species is well-documented in scientific literature. Carl Linnaeus first described the hummingbird hawk-moth in 1758. He included it in the 10th edition of his work, Systema Naturae. More recently, scientists have made progress in understanding its biology at a molecular level. As of 2018, the species' mitogenome has been successfully sequenced. Beyond formal science, the moth holds a place in human culture. In some traditions, they are seen as lucky omens. For instance, a swarm was famously observed flying across the English Channel on D-Day during World War II.

The distribution of these moths is quite vast, stretching from Portugal to Japan.

Distribution map Macroglossum stellatarum
Distribution map Macroglossum stellatarum

They primarily breed in warmer climates, such as North Africa and southern Europe. In Spain, the species is highly productive, producing three generations in a single year. While they are strong fliers that disperse widely in summer, they rarely survive winter in northern latitudes, such as north of the Alps. However, climate change is shifting these patterns. In places like Britain and Ireland, populations are expanding. Warmer temperatures may be allowing these moths to become resident instead of migratory, as they can now overwinter in those regions.

The visual capabilities of the hummingbird hawk-moth are exceptionally advanced. They possess a trichromatic visual system, meaning they can see three different colors. Their eyes are most sensitive to wavelengths between 349 and 521 nm. Remarkably, they can distinguish color differences as small as 1 to 2 nm. This level of precision is even greater than that of the western honey bee. While they have fewer ommatidia, or individual eye units, than some other moths, they have a larger optic lobe. This larger volume provides more tissue for processing complex visual information. This allows them to rely heavily on visual identification when choosing food plants.

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🖼️ Images & Media (3)
File:Distribution map Macroglossum stellatarum.svg
Distribution map Macroglossum stellatarum.svg
File:Macroglossum stellatarum on flowers - nectaring process.png
Macroglossum stellatarum on flowers -...
File:Sphingidae - Macroglossum stellatarum - Habitat.JPG
Sphingidae - Macroglossum stellatarum -...
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