Rapid changes in the body can then be observed as the lifestyle of the frog changes completely. The spiral‐shaped mouth with horny tooth ridges is resorbed together with the spiral gut. The animal develops a big jaw, and its gills disappear along with its gill sac. Eyes and legs grow quickly, a tongue is formed, and all this is accompanied by associated changes in the neural networks (development of stereoscopic vision, loss of the lateral line system, etc.) All this can happen in about a day. It is not until a few days later that the tail is reabsorbed, due to the higher thyroxin concentrations required for tail resorption.
raPid Changes iN the BOdy CAN tHeN be obseRveD AS the LifeStyle oF tHE FrOg cHaNGeS completely. the spirAl‐sHaPEd moUth witH horny TOotH RidgES iS resoRbeD togethEr wIth tHe spIRAl gUt. tHe Animal dEvelops a BiG jAW, aNd ItS gIlls disappear aLOng WITh its gIll saC. eyEs and leGs GroW qUiCKlY, a ToNGue iS fORmed, ANd alL thiS is AccoMPaniEd by aSsociaTeD chAnGes iN the nEural neTwOrKs (DevEloPmEnt Of steReoscOpIc vision, lOsS oF the lateral LiNe sYstEm, EtC.) all tHis can hapPen In abOuT a day. it is NoT untIl a few DAyS lAter That the TaIl iS reabsOrBed, DuE To The HighEr tHyroxin coNcenTrations requiReD FOr tail rESorptioN.