Overview
Kirk’s Leaf-mimic Katydid (Eulophophyllum kirki) is a breathtaking orthopteran described in 2016 from the pristine dipterocarp forests of Danum Valley in Malaysian Borneo. Renowned for exhibiting one of the most astonishing examples of leaf mimicry in nature, adult females possess broad, leaf-shaped wings rendered in a striking rose-pink and crimson hue with realistic false leaf venation, allowing them to vanish perfectly amongst young, anthocyanin-rich rainforest foliage.
Biology and Physical Characteristics
The morphology of Eulophophyllum kirki demonstrates profound sexual dimorphism and protective mimesis. While males exhibit brilliant green leaf-like forewings, adult females display broad, oval tegmina saturated in vivid shades of pink and burgundy, patterned with intricate branching veins that perfectly imitate the reddish tint of tender newly unfurled tropical leaves. Even their legs are modified into flattened leaf-like lobes, completing an unbroken illusion that foils keen-eyed avian predators.
Behavior and Ecology
Strictly arboreal and predominantly nocturnal, Kirk’s Leaf-mimic Katydids spend the sunlit hours frozen in complete immobility against canopy foliage, pressing their leaf-like appendages flat against twigs. When dusk descends, they move deliberately through the subcanopy to graze on tender leaves. Males produce ultrasonic courtship calls using tegminal stridulation, calling receptive females across the dense rainforest canopy.
Conservation and Human Impact
Because the primary known population resides within the rigorously protected Danum Valley Conservation Area, the immediate survival of the species is safeguarded from commercial logging. However, widespread conversion of surrounding lowland Bornean forests into oil palm monocultures isolates rainforest tracts and limits genetic dispersal. Protecting the greater Heart of Borneo corridor remains vital for preserving these extraordinary canopy invertebrates.
Interesting Factoid
Female Kirk’s Leaf-mimic Katydids are completely pink rather than green, perfectly mimicking the red-and-pink newly sprouted leaves of rainforest canopy trees that have not yet developed chlorophyll.
Last updated: October 2026