Giant Swan

Giant Swan also known as Cygnus falconeri is an extinct specie of very large swan from the Middle Pleistocene period of Sicily and Malta.

 It had a wingspan of 3 metres and weighed about 16 pounds. Research suggests it was well adapted for walking but had little or no flying ability. 

It would have been taller than the dwarf elephants that roamed the region. It became extinct before the arrival of humans in the region. 

The reason behind its disappearance may have been climate change or predation.