This is the Chironius scurrulus, one that undergoes changes while growing up.
The Chironius scurrulus is known as the Rusty whip snake. In Suriname it is best known as the Ingibangi snake. They are slender fast moving snakes that are seen active during broad daylight.
As seen in the pictures below you can see how this snake undergoes a color transformation. The hatchlings are born leaf green and are also easy to approach to take pictures.
As time passes by these snakes change also into another color, mahogany red. The head is usually a bit darker than the body. They can reach a length of at least 1.8 m/2.25 m.
They are common snakes in the Amazon, especially in primary and secondary forest. Even though they are known as semi arboreal snakes they also feel like a 'fish' near or close to water.
They hunt usually on small mammals, small birds, reptiles and amphibians.
It looks like these snakes are up to no good; head lifted inches above the ground. Some may think that they are in an attacking position, but it is usually out of curiosity that they 'stand' like that.
The Chironius scurrulus is a non venomous snake.
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