Overview
The Bunny Harvestman (Metagryne bicolumnata) is one of the most astonishingly bizarre arachnids in the Neotropics. First described in 1959 by German arachnologist Carl Friedrich Roewer from specimens collected in the Ecuadorian Amazon, this tiny harvestman resembles a miniature cartoon rabbit head perched on eight spindly legs. Far from being a true spider, it belongs to the order Opiliones, lacking venom glands, fangs, and silk-producing spinnerets, relying instead on heavy body armor and chemical deterrence to thrive in the complex Amazonian understory.
Biology and Physical Characteristics
The most striking feature of Metagryne bicolumnata is its dorsal scute (carapace), which features two prominent, erect, pointed black tubercles resembling rabbit ears. Situated directly beneath these ‘ears’ are two bright, circular yellow spots that convincingly mimic vertebrate eyes. In reality, the harvestman’s actual eyes (ocelli) are located much further forward on an anterior mound called the ocularium, appearing as two tiny black beads. Its fused, pill-shaped body is encased in a rigid, heavily calcified cuticle, supported by elongated, multi-segmented legs that navigate mossy surfaces with nimble dexterity.
Behavior and Ecology
Strictly nocturnal and cryptozoic, the Bunny Harvestman spends daytime hours resting tucked inside damp bromeliad axils, under rotting tree bark, or clinging motionlessly beneath wet moss mats. When darkness falls, it roams across the forest floor and tree trunks in search of food. As an opportunistic omnivore and detritivore, it consumes decaying organic matter, rotting forest fruit, fungal spores, and immobilized soft-bodied insects. When approached by potential predators such as lizards or ants, it tucks its legs tight against its body and secretes foul-smelling benzoquinone fluid from lateral ozopore glands to deter attackers.
Conservation and Human Impact
While currently considered secure within contiguous rainforest preserves of eastern Ecuador, including Yasuní National Park and the Cuyabeno Wildlife Reserve, Metagryne bicolumnata relies fundamentally on the continuous canopy and high humidity of undisturbed tropical primary forest. Deforestation from logging, oil exploration, and agricultural clearing poses long-term habitat fragmentation risks. Maintaining broad biological corridors across the Andean-Amazonian transition zone ensures the survival of such micro-endemic invertebrates.
Interesting Factoid
The bright yellow ‘eyes’ and black ‘ears’ on the Bunny Harvestman’s back are completely fake; evolutionary biologists hypothesize this deceptive head mimicry makes the harvestman appear to be a much larger, watchful vertebrate to ward off hunting jumping spiders and birds.
Last updated: October 2026