The history of acclimatisation experiments, whether intentional or accidental, dates back to the arrival of man on these shores. The Maori brought no herbivorous animals with him, but the Polynesian rat and dog were introduced during this period and it is probable that the Maori hastened the disappearance of the moa and the native swan. The first intentional introductions were made in the years following the second and third voyages of Captain Cook who landed several animals in New Zealand after he had discovered on his first voyage (1769–70) that there were no large animals available for food. Whalers, sealers, the early explorers, and first emigrants introduced pigs, goats, horses, cattle, and sheep between 1774 and 1840. Accidental introductions which occurred at the same time were the black and brown rats, mice, cats, and dogs. All of these animals, with the exception of rats, mice, and pigs, were restricted initially to the small settled localities and consequently had little effect on native flora and fauna.