See the world's biggest heart

As the largest animal to have ever lived, the blue whale (Balaenoptera musculus) can also be expected to have some record-breaking internal organs. Tales of its heart being as big as a car, with the aorta (its main artery) large enough for a human to swim through abound, but as finding intact specimens to research is rare, the truth has been difficult to find out.
So when a dead blue whale washed ashore in Newfoundland, Canada, experts saw a valuable opportunity.

A team from the Royal Ontario Museum (ROM) was sent to dissect the 76.5ft (23.3m) blue whale, which had died after becoming trapped in ice.
The organ that they retrieved can be seen here.