| The European edible frog,Rana esculenta,croaking,with its twin vocal sacs inflated. The sacs are used as a resonant cavity to increase the volume of the call. R. esculenta is found throughout Europe. Although not native to Britian,it has been introduced by man and several colonies exist | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Nuridsany, Claude / Perennou, Maria |
| Taille de l’image : | 5234 px × 3468 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : |
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