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SYDNEY, Sept. 17
Xin xinhua) -- An extinct bag of animals in Australia, a bag of slugs, may weigh more than 1 ton (1000 kg) and maintain a fixed angle of about 100 degrees in the elbows of the fore limbs, a form that is different in known mammals, a new study has found.
bagons appeared in eastern Australia about 25 million years ago and be extinct about 10,000 years ago. Archaeological studies have previously known that the kangaroo is large in size and strong in limbs, but there is a lack of detailed research on its limb shape.
researchers at Monash University in Australia and other institutions reported in the new issue of the American Journal of Public Library of Science, General, that they analyzed more than 60 fossil specimens of bagels of different geological age to understand the function and evolution of the limbs of the pouches. It was found that the bag's weight may be bigger than previously thought, and the fore limbs have a unique shape.
researchers used body proportions to estimate the size of the bag, and found that the largest bag could weigh more than 1,000 kilograms, which had previously been thought to be around 200 kilograms. In addition, the fore limb muscles of the bag is very developed, and the elbows are fixed, maintained at a angle of about 100 degrees, ideal for picking up leaves and other food.
researchers say the study is the first to reveal the shape of the fore limb of the bag, but many questions remain to be answered due to the missing fossils of areas such as the shoulder, and hope to find more material in the existing museum collection for further study.