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Snakes can sidewind over sand, leap between trees, and undulate underwater.

Snakes slither, sidewind and have even been known to launch themselves from one tree to another.

"One of the first surprises was how nice these animals are as subjects - they tend to just sidewind on command," Dr Goldman told the BBC.

They opened vistas, and I remember how when, much later, I came to consider the designed picture, first in Edmond About and then in Alphonse Daudet, of fifty features symptomatic of the social pace at which the glittering r�gime hurried to its end, there came back to me the breath of this sidewind of the frenzied dance that we had caught during those numerous and so far from edifying hours in our fine old deep-seated compartment.

The main difficulty arose from the tendency again to smuggle in statements favourable to infallibility, and paving the way for its definition by a sidewind.