remain still when in the presence of a human; some will also shake nervously. They can bite and scratch out of fear when held by a human, but a firm grip will cause them to remain still. Although they can be tamed, they are asocial, and are not considered appropriate as pets; they have an unpleasant odour, and neither demonstrate nor respond to affection. Until recently, the devil was not studied much by academics and naturalists. At the start of the 20th century, Hobart zoo operator Mary Roberts, who was not a trained scientist, was credited for changing people's attitudes and encouraging scientific interest in native animals (such as the devil) that were seen as fearsome and abhorrent, and the human perception of the animal changed. Theodore Thomson Flynn was the first professor of biology in Tasmania, and carried out some research during the period around World War I. In the mid-1960s, Professor Guiler assembled a team of researchers and started a decade of systematic fieldwork on the devil. This is seen as the start of modern scientific study of it. However, the devil was still negatively depicted, including in tourism material. The first doctorate awarded for research into the devil came in 1991. In captivity Early attempts to breed Tasmanian devils in captivity had limited success. Mary Roberts bred a pair at Beaumaris Zoo (which she named Billy and Truganini) in 1913. However, although advised to remove Billy, Roberts found Truganini too distressed by his absence, and returned him. The first litter was presumed eaten by Billy, but a second litter in 1914 survived, after Billy was removed. Roberts wrote an article on keeping and breeding the devils for the London Zoological Society. Even by 1934, successful breeding of the devil was rare. In a study on the growth of young devils in captivity, some developmental stages were very different from those reported by Guiler. The pinnae were free on day 36, and eyes opened later, on days 115–121. In general, females tend to retain more stress after being taken into captivity than males. Tasmanian devils were displayed in various zoos around the world from the 1850s onwards. In the 1950s several animals were given to European zoos. In October 2005 the Tasmanian government sent four devils, two male and two female, to the Copenhagen Zoo, following the birth of the first son of Frederik, Crown Prince of Denmark