(Addendum below.) This appears to be a green tree python (Morelia viridis, SE Asia and Australia); notice how it remains absolutely motionless but waves its brightly-colored tail, a behavior called “caudal luring.” As this paper inHerpetologica notes:
Caudal luring by ambush-foraging snakes can increase their encounter rates with prey (Neill, 1960). The wiggling of a brightly colored tail presumably mimics the movements made by insect larvae, which are prey items of frogs and lizards (Greene and Campbell, 1972). Frogs and lizards are attracted to the lure and become prey themselves when they move within striking distance of the snake (Greene and Campbell, 1972). The use of this behavior as a foraging strategy has been well documented in viperids, but previous studies did not test whether this behavior varies among age classes or sexes.
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