Overview
The Gliding Treefrog (Agalychnis spurrelli), also known as the Spurrell’s Leaf Frog, is an extraordinary canopy amphibian celebrated for its aerodynamic adaptations. Endemic to the hyper-humid rainforests of the Chocó biogeographic region and southern Central America, this close relative of the Red-eyed Treefrog possesses expansive, parachute-like webbing between both its fingers and toes, allowing it to parachute and glide between high canopy branches to escape predators or descend to explosive breeding assemblies.
Biology and Physical Characteristics
Agalychnis spurrelli exhibits a uniform pale pea-green to emerald dorsal surface, frequently flecked with tiny white enamel-like spots that mimic fungal leaf blotches. Its flanks, thighs, and webbed membranes are tinted in brilliant flash-colors of rich yellow and fiery orange. Unlike its red-eyed cousin, the Gliding Treefrog features dark ruby-red or reddish-brown irises and extensively dilated digital discs backed by full interdigital webbing that functions like miniature aerodynamic airfoils.
Behavior and Ecology
Strictly nocturnal and predominantly canopy-dwelling, Gliding Treefrogs spend most of their lives tens of meters above the forest floor. When leaping into the open air, they spread all four limbs wide, tilting their webbed feet to generate lift and steer controlled glides. Breeding is explosive: following heavy monsoon cloudbursts, thousands of adults descend simultaneously from the high canopy to congregate on vegetation overhanging forest ponds, depositing egg masses onto leaves that drip hatched tadpoles into the water below.
Conservation and Human Impact
Classified as Least Concern by the IUCN, the Gliding Treefrog occurs in high densities within intact primary forests across the Osa Peninsula in Costa Rica and Colombia’s Chocó reserves. However, rapid lowland timber extraction, agricultural conversion, and climate-induced alterations to seasonal rainfall patterns represent continuous challenges to its explosive breeding cycles.
Interesting Factoid
During an aerodynamic leap, the Gliding Treefrog can control its trajectory at angles shallower than 45 degrees, steering mid-air using its massive webbed hands and feet.
Last updated: October 2026