Hammond, “is that these animals are mainly suited to the conditions of the country they come from and they have difficulty coping with the often harsh environment of developing countries. ”
Dr Hammond märkis: „Probleem on selles, et need loomad on peamiselt kohandunud eluks neis riikides, kust nad toodi, ning neil on raske kohaneda arengumaade sageli karmi elukeskkonnaga. ”