Add Yahoo as a preferred source to see more of our stories on Google. Your blood's natural limit to how much oxygen it can hold means you can't stockpile it. Lisa520/E+ via Getty Images You need to ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Blanding's turtles can ...

Animals are incredibly adaptable creatures that have developed a variety of survival mechanisms throughout their evolution. Many amphibians, like frogs, axolotls, and caecilians, can breathe through ...