A Very Big Heart
The largest animal on Earth also has the largest heart. A blue whale heart like the one modeled here is nearly the size of a small car, weighs more than half a ton and is responsible for pumping some 10 tons of blood through the whale's vast circulatory system.
"You can climb inside this one. Everyone says that's a fun thing for kids to do, but I climbed inside, too," said Flynn. "I'm a pretty big guy -- about the limit of what you get through a blue whale's blood vessel."
Image: AMNH/D. Finnin