In one species observed by me, all the avicularia on the same branch often moved simultaneously backwards and forwards, with the lower jaw widely open, through an angle of about 90 degrees, in the course of five seconds; and their movement caused the whole polyzoary to tremble.
Nik azterturiko espezie batean adar bateko avikulario guztiak sarri batera mugitzen ziren atzera eta aurrera, behe-baraila zabalik, 90º inguruko angelua eginez bost segundotan, eta mugimendu honek dardar jartzen zuen polizoo guztia.