Hairy-Eyed Bee-Mimic Fly

mallota posticata

The Hairy-Eyed Bee-Mimic Fly (Mallota posticata) is a remarkable species of hoverfly native to North America. At first glance, this insect is frequently mistaken for a bumblebee due to its dense, fuzzy coat of yellow and black hairs and its robust body shape. This mimicry is a classic example of Batesian mimicry, protecting the harmless fly from predators by making it appear armed with a stinger. In reality, these flies are gentle pollinators that play a key role in forest ecosystems, visiting a wide variety of spring wild flowers. While adults spend their time in the canopy and understory searching for nectar, the larvae have a vastly different, semi-aquatic lifestyle. They develop in wet, decaying wood cavities and tree holes, where they feed on organic debris and help recycle nutrients back into the forest.

Habitat: Found in mature deciduous and mixed woodlands, particularly near damp areas, swamps, and forests with older trees containing water-filled rot holes.

Appearance

This medium-to-large hoverfly, typically measuring 1.2 to 1.6 centimeters in length, mimics a bumblebee with a dense covering of yellow hair on its thorax and the front of its abdomen, followed by black hairs toward the rear. Its most distinguishing feature is its large compound eyes, which are covered in fine, short hairs visible under close magnification. The wings are clear with dark, well-defined veins, and because it is a true fly, it possesses only a single pair of wings and short, three-segmented antennae, unlike the four wings and long antennae of the bees it mimics.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderDipteraFamilySyrphidaeGenusMallota

Hairy-Eyed Bee-Mimic Fly

Interesting facts

Despite looking exactly like a stinging bumblebee, this hoverfly is completely harmless and lacks a stinger entirely.

Its larvae are known as 'rat-tailed maggots' because of their long, telescopic tail-like breathing tube.

The fine hairs on its compound eyes may help detect wind currents or prevent sticky pollen from obstructing its vision.

They are incredibly agile flyer and can fly backwards and sideways to escape predators.

Special abilities

Mimics the appearance, buzzing flight sound, and behavior of bumblebees to deter avian predators.

Utilizes rapid, independent wing beat adjustments to hover perfectly still in mid-air before darting away instantly.

The aquatic larvae possess a long, retractable breathing tube that allows them to extract atmospheric oxygen while submerged in oxygen-depleted decay pools.

Measurements & details

Length: 12-16 cm
Wingspan: 2-3 cm
Weight: 0.0001-0.0003 kg
Top Speed: 15 km/h
Clutch Size: 50-150
Incubation: 2-4 days

Diet & Feeding

Adults feed primarily on the nectar and pollen of spring-blooming forest flowers, while the aquatic larvae are detritivores feeding on decaying plant matter.

Age differences: Larvae are aquatic detritivores that consume rotting organic material and associated microbes in tree holes, whereas adults feed exclusively on floral nectar and pollen.

Primary Foods

Flower nectar
Pollen
Decaying wood slurry
Microorganisms

Foraging Method

Foraging

Ecological connections

competitor

Common Eastern Bumblebee

Bombus impatiens

The fly mimics this common stinging bee to gain protection from visual predators like birds.

host plant

White Oak

Quercus alba

Provides critical breeding habitat, as larvae develop inside the tree's wet, decaying wood cavities.

eaten by

Great Crested Flycatcher

Myiarchus crinitus

This insectivorous bird preys on adult hoverflies in the forest understory.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Hairy-Eyed Bee-Mimic Fly?

The easiest way to identify Hairy-Eyed Bee-Mimic Fly is to use the Snappit nature identifier app.

How long is Hairy-Eyed Bee-Mimic Fly?

12-16 cm

What is Hairy-Eyed Bee-Mimic Fly's wingspan?

2-3 cm

How much does Hairy-Eyed Bee-Mimic Fly weigh?

0.0001-0.0003 kg

How fast can Hairy-Eyed Bee-Mimic Fly move?

15 km/h

What does Hairy-Eyed Bee-Mimic Fly eat?

Adults feed primarily on the nectar and pollen of spring-blooming forest flowers, while the aquatic larvae are detritivores feeding on decaying plant matter.

Where is Hairy-Eyed Bee-Mimic Fly usually found?

Found in mature deciduous and mixed woodlands, particularly near damp areas, swamps, and forests with older trees containing water-filled rot holes.

How does Hairy-Eyed Bee-Mimic Fly hunt?

Foraging