Snow leopards have less developed vocal cords than their big fellow cats, which means they can’t roar, but instead make a purr-like sound called a chuff. Scientists have researched why some cats have a higher-pitched meow than others for a 2010 study published in the Linnean Society’s Biological Journal. They found that the call of a kitty is not determined by size, but by habitat. High-frequency
“Social animals, including lions and chimpanzees, are often surrounded by relatives, so it’s not surprising that a female adopts an orphaned family member because they’ve spent a lot of time together,” said evolutionary biologist lead researcher Andrew McAdam. “Nevertheless, red squirrels live in complete isolation and are very territorial, the only time they allow another squirrel.