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The article discusses the fossil snake Tetrapodophis amplectus with four legs of the Early Cretaceous period of (Aptian) Crato Formation in the Gondwana contintent, present day Brazil. An overview of the evolution of the aforementioned snake, including in regard to their evolution from lizards and its aquatic adaptations and short neural spine, is provided.

Discusses the reason why snakes' tongues are forked. Hypothesis of the forked tongue as a chemosensory edge detector used to follow pheromone trails and cospecifics; Basis for instantaneous assessment of trail location; Forked tongues' association with a wide searching mode of foraging.

Deals with the different perspectives on the origin of snakes. Idea of limbed snakes; Links of Haasiophis and Pachyrhachis to terrestrial Macrostomata.

The article focuses on two studies on the genomes of the Burmese python and the king cobra, which appeared in the journal "Proceedings of the National Academy of Sciences." It mentions that the studies reveal the molecular basis for snake features and represents the opposite ends of their extreme evolution. As per the study, the ballooning organs of the python represents one extreme while the venom of king cobra other.

The article discusses research by Martill et al. regarding a fossil from the Brazilian Cretaceous period containing a snakelike species with both hind- and forelimbs that represents the early transitional stages of snakes from their original lizard-like tetrapod bodies.

The article discusses a report in the journal "Nature" on research by Patrick Tschopp and colleagues investigating penis development in mouse and snake embryos that found, in snakes, the penis arises from what would have been its rear legs, resulting in the formation of two penises.