gambillage

OBS: Le gambillage est souvent le fait d'arachnides qui s'exécutent en s'agitant dans leur toile, mais certaines espèces ne tissant pas de toile ont aussi recours à ce mécanisme de défense.

CONT: ... some neotropical species engage in an action called ""whirling."" ... the spider holds onto the underside of its web and swings its body in horizontal circles until it looks like a blur to the human eye. This is a defense mechanism and serves to make the spider appear bigger than it really is.
OBS: In French, the term ""gambillage"" has a broader meaning and includes both circular (whirling) and bouncing (bobbing) movements.