The English publisher John Murray III created a proper travel guide based on the descriptions of different foreigners who visited the Algarve during the first half of the 19th century containing some practical advice:
“(…) travellers must protect themselves against a very dangerous reptile, the gecko, or as it is known here the ‘osga’. A bite from this lizard, although it is often not fatal, is in all cases dangerous, especially when inflicted on an outsider, feverish from the journey and the heat of the Algarve sky. They are generally to be found in cool, dark places and sometimes they take refuge in unoccupied houses. And so when they are lodged in one of these houses, tourists must take care."