Blue-winged kookaburra highly aggressive in the first week of life, and the youngest chick is often killed by the older chicks during this period. Once fledged, juvenile birds need to be taught how to hunt by their parents for a further 6–10 weeks before they can properly fend for themselves. The red goshawk and rufous owl prey upon the blue-winged kookaburra. Adult birds are also slow flyers and vulnerable to being hit by cars on country roads. Nests are susceptible to raids by Olive Pythons, quolls and goannas. Blue-winged kookaburra The blue-winged kookaburra ("Dacelo leachii") is a large species of kingfisher native
Kookaburra III a very fast sailer. Iain Murray believed her to be the syndicates fastest right up until the defender finals, when "Kookaburra III" finally became faster as a result of a keel modification. The defender series was extremely competitive, with "Kookaburra II", "Kookaburra III" and "Australia IV" all very close in boat speed. This led to extremely close racing, marred only by the large number of protests raised. The red protest flag was a frequent flyer from the stern of a defender boat, with the results of the day's sailing protested nearly every other race. In all, fifty protests were lodged