Hydrophis cyanocinctus has managed to evolve a respiratory system that works in much the same way as gills
The first sign of something unusual was an odd hole in the roof of this species' skull.
No trace of such a foramen has ever been found in a modern snake. In fact, snakes are thought to have lost the pineal foramen at least 100 million years ago, which is the age of the oldest reasonably complete fossil snakes. We then examined other snakes, both terrestrial and marine, using the same methods, and realised that this network of blood vessels inWhile a network of blood vessels is expected to be present under the skin of all snakes, what is special aboutis the greatly exaggerated size of the blood vessels and the fact that they converge towards a single large vein that goes into the brain.This strange network of blood vessels makes sense when we consider that sea snakes can breathe through their skin.
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