The horseshoe crab in the amazing YouTube clip captured at Aquaria KLCC in Malaysia appears to have gotten itself in a tricky ...

A horseshoe crab upside down. These animals have survived 3 of Earth's extinctions that wiped out most other species. So, what is it about horseshoe crabs that enabled them to survive?

When a crab gets stuck upside down, it uses its tail, called a telson, to flip over! Horseshoe crabs can also use their telson as a rudder to help steer as they swim upside down. Luckily ...