AT A GLANCE
- Common Name: Lime Hawk-moth
- Scientific Name: Mimas tiliae
- Category: Invertebrates
- Subcategory: Insects
- Range: Widespread across the temperate Palearctic, throughout Europe from southern Scandinavia and the British Isles south to the Mediterranean, and east across Russia to Siberia
- Habitat Type: Broadleaved deciduous woodlands, suburban parks, lime-tree avenues, orchards, and urban gardens containing lime, birch, or alder trees
- IUCN Red List Status: Not Evaluated (widely distributed and abundant)
- Lifespan: Adult lives only 7 to 14 days (non-feeding); total life cycle 1 year
- Diet: Herbivorous (adults have non-functional mouths and do not feed; caterpillars eat leaves of lime (Tilia), silver birch, alder, and elm)
- Average Size/Weight: Wingspan 60 to 75 mm; body length 30 to 40 mm
- Key Defining Feature: Superb dead-leaf mimic with scalloped, jagged-edged wings displaying a magnificent palette of olive-green, pinkish-buff, and chocolate-brown with dark central saddle patches
Overview
The Lime Hawk-moth (Mimas tiliae) is one of the most exquisitely camouflaged and aesthetically stunning night-flying insects of the European summer. Belonging to the hawk-moth family Sphingidae, this large, heavy-bodied moth is a consummate master of mimetic deception: when resting on a tree trunk or among foliage, its scalloped, angular forewings and subtle tones of olive-green, buff, and chocolate brown disguise it perfectly as a torn or withered leaf.
Biology and Physical Characteristics
Mimas tiliae has a wingspan of up to 7.5 cm, with forewings that feature a distinctively ragged, deeply scalloped outer margin unlike the smooth contours of most other hawk-moths. The species displays remarkable color variation: the forewings range from cool pistachio-green and moss-olive to warm pinkish-buff or hazel-brown, divided by a broad, dark olive-brown or chocolate central band that is often broken into two separate saddle spots. The hindwings are a contrasting ochre-yellow with a dark charcoal submarginal band. Adult moths possess completely atrophied, non-functional mouthparts and a vestigial digestive tract, relying entirely on fat reserves accumulated during the caterpillar stage.
Behavior and Ecology
Adult Lime Hawk-moths emerge in May and June, flying primarily during the middle of the night. Because they cannot feed, their short adult lives are devoted entirely to reproduction: females emit potent airborne pheromones to attract mates, and males use their feathery, sensitive antennae to locate them over long distances. During the day, they rest motionless on the trunks or branches of lime (Tilia cordata and T. platyphyllos) and birch trees, holding their wings in an arched, roof-like posture that looks identical to a cluster of decaying leaves. The striking caterpillar is rough-textured and lime-green with seven yellow-and-red diagonal lateral stripes, a rough blue-and-yellow tail horn, and a curious granular ‘shield’ beneath the anal flap.
Conservation and Human Impact
The Lime Hawk-moth has not been evaluated by the IUCN, but is universally regarded by entomologists as secure, common, and thriving across its range. It has adapted exceptionally well to urban and suburban environments, benefiting from the widespread planting of decorative lime trees along city streets, boulevards, and in municipal parks. No major conservation threats endanger the species.
Interesting Factoid
Adult Lime Hawk-moths have no mouth and cannot eat or drink a single drop of nectar during their adult lives; they survive entirely on energy stored as fat when they were green caterpillars.