When the first embryo in each uterus reaches a certain size it consumes all its siblings. Sources: Radio 4 Natural Histories, BBC One Shark, Planet Earth and In Living Memory.

While being towed, she gave birth to five live pups and one stillborn, all measuring between 4.5 and 6.5 feet: as large as a full-grown whitetip reef shark. During the 20th century, basking sharks ...

Between eight and 14 feet but can reach up to 23 feet Using this method, scientists discovered Greenland sharks have a life expectancy of at least 272 years and could reach 392, give or take about ...

It is estimated that its jaw would span 2.7 by 3.4 metres wide, easily big enough to swallow two adult people side-by-side. These jaws were lined with 276 teeth, and studies reconstructing the shark's ...