This general absence of frogs, toads and newts on so many true oceanic islands cannot be accounted for by their physical conditions; indeed it seems that islands are peculiarly fitted for these animals; for frogs have been introduced into Madeira, the Azores, and Mauritius, and have multiplied so as to become a nuisance.
Benetan ozeanikoak diren hain irla askotan igel, apo eta uhandreen gabezia orokor hori ezin egotz dakieke irlon baldintza fisikoei; izatez, badirudi irla horiek bereziki aproposak direla aipaturiko animaliontzat: igelak Madeira, Azore eta Mauriziora eraman dituzte eta aspergarri bihurtu arteraino ugaldu dira bertan.