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There are several theories to explain this relatively sudden extinction. The leading explanation of around was that this was due to environmental and ecological factors. They were very large, usually over 88 pounds(40kg) in weight and generally at least 30 per cent bigger than any of their still living relatives. The loss of large browser species, however - like mastodons, giant sloths and Australia's diprotodons, all of which foraged on shrubs and trees - was not found to be associated with a similar increase in wildfires.Įarth was once inhabited by a variety of giant forms of animals that would be recognisable to us today in the smaller forms taken by their forbears. It took time for new grazers, including livestock, to adapt to the new ecosystems. This revealed not only that wildfire activity appeared to increase in the wake of megafauna extinctions - but that the Americas, which lost more grazers, saw larger increases in fire levels than in Australia and Africa, where changes were lesser.Īccording to Dr Karp and her colleagues, grasslands worldwide were transformed by lose of herbivores, the resulting fires and the loss of grazing-tolerant grasses. Next, the team compared this data with records of past wildfire activity as recorded by the presence of charcoal in lake sediments from 410 sites across the globe. Their analysis indicated that South America lost the most large grazers (83 per cent of all species), followed by North America (68 per cent), Australia (44 per cent) and then Africa (22 per cent).
GRASSLAND ANIMAL S FREE
Please check out our new “Animal World” App in our store to get a free experience of this app before purchasing.In their study, the experts compiled a list of large, now lost mammals and the approximates dates at which they went extinct across four continents.
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