Insects Active during the day

Adonis Blue

Polyommatus bellargus

iNaturalist Wikipedia

A jewel of the chalk downs, the Adonis Blue is famous for the male's electric sky-blue wings and its remarkable partnership with ants. This specialist butterfly is a master of the sun-drenched hillsides of Europe.

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0 Habitats

Quick Identification

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Size

Wingspan of 30–40 mm (1.2–1.6 inches); weight is negligible, typically under 0.5 grams.

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Colors

Males are a brilliant, iridescent sky blue; females are chocolate brown with orange spots and a dusting of blue near the body. Both sexes feature a white wing fringe intersected by distinct black lines.

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Key Features

Brilliant sky-blue upper wings in males
White wing margins distinctly chequered with black
Underwings are grayish-brown with intricate black spots ringed in white
Females have a row of orange crescents along the hindwing edges

When You’ll See Them

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Activity pattern Active during the day

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Peak hours 10 AM - 4 PM

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Season May-June and August-September

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Diet Adults feed on nectar from a variety of wildflowers including Bird's-foot Trefoil, Thyme, and Marjoram. Larvae feed exclusively on Horseshoe Vetch (Hippocrepis comosa).

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Habitat Strictly limited to chalk and limestone grasslands with short turf and abundant Horseshoe Vetch.

public Geographic range

Where Does the Adonis Blue Live?

The Adonis Blue is primarily a European specialist, with its native range stretching across the southern and central parts of the continent into Western Asia. It thrives in the warm, calcareous downlands of Southern England, which marks its northernmost limit, and extends through France, Spain, and Italy into the Balkans and Turkey. While it is not an introduced species elsewhere, its populations are highly localized due to its strict dependence on specific soil types and host plants.

Basemap © OpenStreetMap contributors

8 Countries

4.2M km² Range

Least Concern Conservation

GB United Kingdom FR France ES Spain DE Germany IT Italy Greece Turkey Bulgaria

Elevation range

0 m1,000 m2,000 m4,000 m

Sea level – 2,000 m

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iNaturalist / Verified observation data

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Behavior

The Adonis Blue is a sun-loving butterfly known for its erratic, low-to-the-ground flight pattern. Males are particularly conspicuous as they flit over short turf in search of mates, often congregating in 'leks' on warm, south-facing slopes. They are highly sensitive to temperature, only becoming active when the sun provides enough warmth to power their flight muscles. During the heat of the day, they can be seen basking with wings spread wide to soak up solar energy.

One of the most fascinating aspects of their behavior is their symbiotic relationship with ants, specifically species like Myrmica sabuleti. The larvae secrete a sugary substance that ants crave; in exchange, the ants protect the caterpillars from predators and even carry them into their nests for safety during the pupation stage. This 'bodyguard' service is essential for the butterfly's survival in the wild.

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Camera Tips

Capturing the Adonis Blue on an AI-powered backyard or trail camera requires a specialized setup because of their small size and specific habitat. For the best results, place your camera on a low-profile tripod or a ground mount, keeping the lens no more than 12 to 18 inches from the ground. Position the camera facing a patch of Horseshoe Vetch or popular nectar sources like Wild Thyme. Because these butterflies are cold-blooded, they are most predictable on south-facing slopes where the sun hits first in the morning.

To get clear images, use a camera with a macro lens or a very short minimum focus distance. If using a standard trail camera, look for 'close-focus' adapters. Set your camera to a high-speed 'burst' mode or high-frame-rate video (60fps or higher) to capture the rapid, fluttering movement of their wings. The brilliant blue of the male is highly reflective, so try to angle the camera slightly away from the direct midday sun to avoid 'blown-out' highlights that erase the wing detail.

Timing is everything for the Adonis Blue. They have two distinct 'broods' or emergence periods: one in late spring (May-June) and a second in late summer (August-September). During these windows, the best time to capture them is between 10:00 AM and 2:00 PM when they are most active. If you are using a motion-triggered camera, ensure the sensitivity is set to 'high' as their small frame may not always trigger standard PIR sensors. Providing a small, flat stone in a sunny spot can act as a natural 'lure,' as males will often land there to bask and regulate their temperature.

Similar Species

Species that look similar or are commonly confused with Adonis Blue.

Common Blue

Lacks the black chequering in the white wing fringe and the blue is a darker, more violet shade.

Chalkhill Blue

Much paler, 'silvery' blue in males and significantly larger in size; emerges later in the summer.

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Frequently Asked Questions

Adonis Blue butterflies are most active during the warmest part of the day, typically between 10 AM and 4 PM, when the sun is strong enough to warm their flight muscles.

To attract them, you must live in a chalk or limestone region and plant their sole larval food plant, Horseshoe Vetch, along with nectar-rich flowers like Bird's-foot Trefoil and Wild Thyme.

Adults drink nectar from flowers such as Horseshoe Vetch, Thyme, and Marjoram, while the caterpillars feed exclusively on the leaves of the Horseshoe Vetch.

No, they are highly specialized insects. They are rarely found in typical suburban gardens unless the garden is directly adjacent to a managed chalk grassland or downland.

The easiest way to distinguish them is by the white fringe on the wing edges; the Adonis Blue has distinct black lines cutting through the white fringe (chequered), while the Common Blue's fringe is plain white.

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