Great Crested Newts

To give them their proper Latin name, Great Crested Newts are known as Triturus cristatus.

Great Crested Newts are widely distributed throughout Britain but this distribution is extremely patchy; they’re absent from Ireland and have disappeared from many sites across Europe. They are the largest of our native newt species. During the breeding season males develop a jagged crest which has a break at the base of the tail and females take on a ‘bulky’ appearance.

Source: 

http://www.froglife.org/amphibians-and-reptiles/great-crested-newt/