The Philippine Sail-finned Lizard, usually abbreviated to Sailfin Lizard, is endemic to the Philippines and lives by rivers and waterbodies.
The full name is used to differentiate from the similar Amboina Sail-finned.
The sail fin is an extendable fin on its tail which facilitates swimming. As its Latin name indicates, it is often in water and it has
modified back toes to enable it to run on water (usuing 2 legs and its tail like a basilisk).
The male lizard, which can grow to a length of over a metre, is more colourful than the female and develops blue/violet colouring as it ages.