Overview
Lord Derby’s Scaly-tailed Squirrel (Anomalurus derbianus) is an extraordinary gliding rodent endemic to the tropical rainforest canopies of sub-Saharan Africa. Despite its common name, it is not a true squirrel, belonging instead to the unique and ancient African rodent family Anomaluridae. Renowned for its wide gliding membranes and a double row of raised, pointed keratin scales beneath the base of its tail, this nocturnal acrobat sails between emergent rainforest giants with effortless grace.
Biology and Physical Characteristics
The anatomy of Anomalurus derbianus is custom-engineered for high-canopy gliding. A broad furry flight membrane (patagium) extends from its wrists to its ankles, supported at the elbow by a rigid cartilaginous strut. Its dense, silky dorsal fur ranges from silvery-gray to olive-brown, providing camouflage against lichen-encrusted tree bark. Beneath the basal third of its tail sit sixteen heavy, pointed, imbricated horny scales; these rigid keels function like climbing crampons, pressing firmly into vertical bark to prevent slipping when scaling towering hardwood trunks.
Behavior and Ecology
Exclusively nocturnal and arboreal, Lord Derby’s scaly-tailed squirrels spend daylight hours resting in pairs or small family groups inside hollow tree cavities hundreds of feet above the ground. At dusk, they emerge into the canopy, launching into spectacular controlled glides spanning over 100 meters between trees to forage on cambium bark, tender young foliage, and sweet forest fruits. Their agile climbing and seed consumption facilitate natural canopy thinning and forest seed dispersal across the African forest basin.
Conservation and Human Impact
The species is currently classified as Least Concern on the IUCN Red List due to its expansive equatorial distribution and large overall populations within intact forest blocks. Nonetheless, intense commercial logging, deforestation for oil palm and cocoa agriculture, and localized bushmeat hunting threaten populations in heavily fragmented coastal West African forests. Protecting large contiguous national parks and transboundary forest reserves ensures the survival of this canopy marvel.
Interesting Factoid
On the underside of its tail, this remarkable creature has sharp, built-in scales that act like tree-climbing cleats, digging into rough bark to keep the animal from sliding down slick rainforest trunks.
Last updated: October 2026