Facebook post by University of Helsinki

Researchers suggest that snake evolution and diversification was not a straightforward process but rather an interplay between natural selection and developmental processes. This led first to a new underground lifestyle and then subsequent colonization of many habitats such as water, forests, deserts, and prairies.
The ori­gin of snakes – new evol­u­tion­ary scen­ario presen­ted helsinki.fi

The early evolution of snakes happened from surface-terrestrial to burrowing in the lizard-snake transition suggests a research group at the University of Helsinki.