Paradise Flying Snake

Flying snakes glide, they do not fly — like flying squirrels, flying fish, and colugos, they cannot generate lift by flapping and cannot gain altitude, only travel forward while descending. But the paradise flying snake's version of gliding is more active and controlled than most gliders'. It does not just fall in a fixed posture; it continuously undulates its body through the air, banks to steer, and can adjust its trajectory, and it actually glides more efficiently than the "flying" snake's rounder relatives despite having no limbs or membranes at all. Some biomechanists argue it is closer to true controlled aerial locomotion than the passive gliding of a flying squirrel.

It transforms its body into a wing. As it launches from a branch — dropping into a J-shape and then springing up and out — the snake pulls in its ventral scales and splays its movable ribs outward along its entire length. This flattens the body from a round tube into a wide, flattened shape with a concave underside, roughly doubling its width, which works as a rough aerofoil. It holds this shape for the whole glide while sending travelling S-waves down its body. High-speed 3D tracking has shown that this side-to-side and up-and-down undulation is essential — snakes prevented from undulating tumble and fall, while undulating snakes settle into a stable, shallow glide.

From a typical launch height of around 10 metres in a tree, it covers roughly 10 metres of horizontal distance, and from higher launches glides of up to about 30 metres have been recorded, with the snake able to make turns of 90 degrees or more along the way. The glide starts steep and flattens out as the snake picks up speed and its undulation stabilises the flight. Gliding lets the snake move quickly between trees without descending to the ground, escape predators such as birds and larger snakes, and possibly save energy compared with climbing down and back up.

It is not dangerous. It is technically venomous — a rear-fanged colubrid with a mild venom used to subdue lizards and frogs — but the venom is weak, the fangs are small and set far back in the mouth, and the snake is not aggressive toward people; the rare bites reported cause only mild swelling and irritation. It is sometimes kept by experienced keepers but is considered a difficult captive — it is fast, nervous, and prone to stress, needs a tall, warm, humid, densely planted enclosure with lots of climbing branches, and often refuses anything but live lizards, which makes feeding a challenge. Captive-bred animals are scarce.