Philippine sailfin lizard

Hydrosaurus pustulatus, commonly known as the Philippine sailfin lizard or the Philippine sailfin dragon, is a large semiaquatic agamid lizard endemic to all of the major island groups of the Philippines, with the exception of the Palawan islands. Like other sailfin lizards, they are characterized by large, sail-like dorsal crests on their tails. They can grow to a maximum length around 3 to 4 ft (0.91 to 1.22 m). They are strong swimmers, and smaller juvenile lizards can run briefly on the water surface. They inhabit areas of heavy vegetation near coastlines and low-lying rivers, particularly in mangrove forests. They are also known locally as layagan or balubid in Tagalog and ibid in the Visayan languages, among other names.

H. pustulatus is a protected species in the Philippines, as it is a target for the international exotic pet trade for their unique dorsal crests and bright coloration. The heavy deforestation of mangrove habitats in the last few decades is also a concern to their conservation.