Scientists have discovered when the kangaroo learns to expect and is much earlier than expected.
According to new fossils, the foundations of the famous kangaroo advertisement will be 20 million years ago.
Kangaroos live the only major mammal that uses hopping on two legs as the main type of locomotion.
The new cradle cousins could also hope, according to the study of their fossil-like bones, as well as moving on four legs and ramp climbing.
The rare cangaroo fossils were found at Riversleigh in the northwest of Queensland in Australia.
The site is astonishing of grazing, including marsupials, bats, berries, snakes, crocodiles and birds.
"This is one of our most recent marsupials change in Australasia in deeper times," said researcher Dr Benjamin Kear, from Uppsala University in Sweden.
Kangaroos can be a rapidly fastening cover; Using the unique, most effective game in open habitats such as deserts and grasslands.
It has been a long-standing vision that the animals have increased their ability to & # 39; trying to take advantage of climate change, which introduced dry conditions and spread grassland.
But the research, published in the magazine of the Royal Open Science, suggests that the story is not as simple.
Geometric modeling shows that ancient cousins may have new bangles to Using the same range of games such as live kangaroos.
Evidence, according to scientists, has a potential changaroo hop for many millions of years.
"It indicates that a highly successful animal is ideal for the environment and a wide range of habitats and ecosystems and that's why kangaroos are so successful today, "said Dr Kear.
"This is one of the most spectacular and beautiful animals you find most likely."