Considering the large number of venomous creatures that inhabit Australia, the odd-looking, cute and clumsy platypus might seem like a safe option. Think again. A male platypus has ankle spurs that are capable of delivering a wicked sting. So wicked that the excruciating pain can incapacitate an adult human. The pain is also long-lasting, and can even turn into a condition called hyperalgesia, a heightened sensitivity to pain that may last for weeks or months following the initial sting.