### **The Tiger Crane Fly (*Nephrotoma* sp.)**
If you spot a gangly, wasp-like insect bobbing through the tall grass, you’ve likely found a member of the genus *Nephrotoma*. Often called Tiger Crane Flies, these striking insects trade the drab browns of their cousins for high-contrast, "caution" yellow and black markings.
Identification
Measuring between 12–20mm with a sprawling leg span, *Nephrotoma* is defined by its polished, almost metallic appearance. Unlike the matte-grey *Tipula* species, the Tiger Crane Fly’s thorax is shiny, usually featuring three bold, dark longitudinal stripes on a bright yellow backdrop. Look for the "V-shaped" suture on the upper thorax—a hallmark of crane flies—but note the specific wing venation: the "cell dm" in the wing is notably small or absent. Their bodies are slender, ending in a pointed ovipositor (females) or a blunt, club-like bulb (males).
Habitat & Range
These flies are cosmopolitan, found across North America, Europe, and Asia. They favor "edge" habitats—think damp deciduous woodlands, lush garden borders, and riverbanks. You’ll find them most active in low-elevation meadows where the soil remains consistently moist, providing the perfect nursery for their subterranean larvae.
Behaviour
Observers will notice their distinctive "stilt-walking" flight. They are not strong flyers; they seem to "swim" through the air, their long legs trailing behind like anchors. During the day, they rest on the underside of broad leaves, often hanging by just two or four legs. When threatened, they perform a rhythmic "bobbing" or vibrating motion to blur their outline against the vegetation, a clever trick to confuse predators.
Diet
As adults, Tiger Crane Flies are ephemeral beauties; many do not eat at all, living only long enough to mate. Those that do forage sip nectar or honeydew. The real "heavy lifting" is done by the larvae, known as "leatherjackets," which live underground and voraciously consume decaying organic matter and the tender roots of grasses.
Fascinating Fact
The Tiger Crane Fly is a master of "autotomy"—the voluntary shedding of a limb. If a predator (or a curious human) grabs one of those spindly legs, the fly can instantly snap it off at a specialized breakage point to escape. Remarkably, the detached leg will often continue to twitch for several minutes, distractedly dancing while the fly makes its getaway!