World's Longest

It’s no secret that sauropods had really long necks, but now paleontologists claim to have identified the species that takes the crown. According to the team, Mamenchisaurus has the longest neck of any known animal ever, measuring 50 ft (over 15 m).

Having traveled a grand total of 25 miles (40 km) over the course of its historic mission of exploration, NASA's Opportunity Mars rover has taken the record for the greatest distance traveled on another planetary body.