External and internal parasites

Almost all mammals, both wild and domestic, are host to various internal and external parasites. Many of these parasites are harmless, but some may be detrimental to the animal's health. When Europeans first brought out their sheep and cattle, pigs and goats, camels, donkeys, deer, dogs, cats, foxes, rabbits - the full list is formidable - they also unwittingly brought a whole new spectrum of parasites and insect pests. The native marsupials undoubtedly carried parasites of various kinds long...