Reptiles

Common basilisk

Basiliscus basiliscus

A brown common basilisk lizard with a tall head crest perched on a branch over water

Photo: Charles J. Sharp · CC BY-SA 4.0 · via Wikimedia Commons

Where
Estuaries, Dry forest, Your garden
When
Daytime, all year
Size
Up to about 80 cm including the very long tail
Should I worry
Enjoy it
Harmless, and gone across the water before you can point.

Walk the edge of any stream or estuary and watch the bank ahead. A lizard drops from a branch, hits the water and keeps going, upright on its hind legs, feet slapping the surface, for an absurd distance before it sinks and swims for the far side.

Where you’ll see it

Anywhere with water and overhanging branches: estuaries, river banks, ponds and irrigation ditches. Tamarindo’s estuary edges and the mangroves around Playa Grande have plenty.

What to know

Males have the tall crest on the head and back. The water running is real and is done with big fringed hind feet and sheer speed; it lasts a few metres and then the lizard swims or dives. They eat insects, fruit and small animals and are prey for nearly everything, which explains the exit strategy. Entirely harmless to people.

Questions people ask about this one

What is the lizard that runs on water?

The common basilisk. Large hind feet with fringed toes and a fast sprint let it run several metres across the surface before it sinks and swims. It does this to escape, so the way to see it is to walk along a stream and watch the bank ahead.

Wondering what else is out there?

Ask me on the call. I'll tell you what actually shows up in a Coco garden, what to do about it, and the one guy everyone rings when there's a boa in the roof.

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