"The largest specimen ever observed in the tropics stood nearly ten feet (a little over 3 metres) high. No European specimen over eight feet (2.4 metres) had been seen."

This is in opposition to a biological observation known as Bergmann's Rule, which states that within a widely distributed genus, species in colder regions tend to be larger than those in warmer regions. However Bergmann's Rule is mainly applied to birds and mammals (such as humans).