A massive American alligator, estimated at about 12 feet (3.7 m) long, crossed a walking trail in front of visitors at Circle B Bar Reserve in Lakeland, Polk County, Florida, in January 2017. Kim Joiner filmed the slow, high walk on her phone as others stopped to take photos.
Alligators usually crawl on their bellies, but on land they can also use a "high walk", lifting the body well off the ground on straight legs. That upright gait, the armoured scutes along the back and the long, heavy tail are why big gators are often called living dinosaurs. They are not dinosaurs, but crocodilians and dinosaurs are both archosaurs, sharing a common ancestor more than 240 million years ago, and birds are the closest living relatives of crocodilians.
CBC News: Enormous alligator spotted in Florida nature reserve