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   change      cooler      creatures      dense      distances      efficient      elbows      endurance      evolutionary      function      habits      landscape      million      particular      paws      prey      similar      species      styles      victims  
New research suggests that climate helped dogs develop from resembling cats to the way they are today. Researchers from Brown University in the USA believe that 40 years ago, dogs were smaller and hunted like cats. They hid, stalked and ambushed their . As climate change transformed Earth's , the physique and food-gathering of dogs changed. Thick forests that once covered the North American continent started to become less as the planet became . The emergence of grassland meant dogs had fewer places to hide to ambush their . To adapt, they evolved their hunting and slowly grew longer legs.

The scientists analysed how dogs have evolved by looking at the and teeth of 32 different that lived between two million to 40 million years ago. The researchers said that the dogs' elbows, in , were good indicators of change. Dogs from 40 million years ago had elbows that were more to those of cats. Their was to allow the front to swivel so they could grab and hold on to prey. Those elbows changed in dogs to allow them to become runners and thus be able to pursue their prey over long . Teeth in dogs also altered to be more . They became more hard-wearing to be able to hold on to prey.

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