Thank you for your question. I have contacted an authority on Philippine snakes for confirmation, but I believe your snake is a juvenile flying snake (Chrysopelea paradisi variabilis). It is also known as the paradise flying snake and the paradise tree snake. They are rear-fanged and mildly venomous, but their bite is generally not considered to pose a threat to humans. It is effective, however, on the snake's prey - frogs, lizards, rodents, birds, and bats.

These snakes have the ability to launch themselves from the branches of trees and, by using the muscles and ribs to make their belly concave, glide to another location. As they glide, the snake continues to undulate in a serpentine motion to help control its descent.  They may glide for distances of up to 100 meters.

Here's a link to an article from the University of Chicago's School of Medicine on studies of this species' ability to glide:
http://www.uchospitals.edu/news/2005/20050513-snake.html

As soon as I hear from the professor I sent your photo to, I'll be back
 in touch.

I hope this answers your question, and thank you for contacting Ask an Expert.

Jim

Hello again,

The professor I contacted about your snake replied to me this morning.  He confirmed that your snake is a juvenile Chrysopelea paradisi.  He said they are very common in lowland coconut groves.

Hope this information helps, and thank you again for contacting Ask an Expert.

Jim

I received some follow-up information from the professor I contacted about your snake. He said the coloration of the juvenile may lead local residents to confuse it with the Double-barred Philippine Coral Snake (Hemibungarus gemianulis), a deadly 'false' coral snake found in Cebu, Negros and Panay.

You can find additional information about this species at these sites:

https://en.wikipedia.org/wiki/Hemibungarus

https://www.researchgate.net/publication/263375284_The_dangerously_venomous_snakes_of_the_Philippine...

Hope this information helps, and thanks again for contacting Ask an Expert.

Jim