Scientists believe that extraterrestrial life is likely to have a lot in common with life on Earth. Source I have always thought that alien life on a planet similar to ours would have similar body features... hands, legs, etc. And perhaps a water based planet would have body features that aliens need to function like webbed fingers, fins, etc, and rocky planets would have aliens/ creatures with talons and strong claws. That's just my logical thinking. What do you guys think?