5 Most Incredible Discoveries of the Week Crocodiles can do what? By Newser Editors, Newser Staff Posted Feb 15, 2014 5:55 AM CST 2 comments Comments A crocodile at the Sydney zoo in Australia. (AP Photo/Rob Griffith) (Newser) – A strange fact to keep in mind when being chased by a crocodile and an important find about the origins of the first Americans make the list: Crocodiles Can Climb Trees: As far as discoveries go, this is a somewhat terrifying one, assuming one has a healthy respect for crocodiles on the ground: They can climb and perch in trees. And they can really climb, with researchers spotting them more than a dozen feet from the ground. Infant's DNA Pinpoints Origins of First Americans: The DNA from a single infant is shining a light on the true origins of the first Americans. The headline-generating research relies on the DNA of a child buried roughly 12,600 years ago in what is now Montana, and establishes that the first North Americans were born to humans who came to the New World from Asia. New Fossil Find One of History's Greatest: Researchers in Canada have made an extraordinary find: a vast collection of fossils that offer an in-depth look at prehistoric life. The site in Kootenay National Park may end up being one of the richest such troves ever found. Scientists: We've Found Amazon River's True Source: It's an argument that's persisted for nearly four centuries: Where does the Amazon River begin? Researchers now say it's a different river in Peru than is commonly believed, a finding that would make the Amazon even longer. Crazy Ants Have Secret Weapon in Insect War: So-called "crazy ants" are fighting for territory in the US with fire ants, and it turns out they've got a remarkable advantage: a built-in antidote to the venom of their enemy. The trick could have big implications for the Southeast. Click for more discoveries, including a study that says raindrops aren't shaped like tears after all.