Reptiles

Black spiny-tailed iguana

Ctenosaura similis

A black spiny-tailed iguana with a grey and black banded body and a spiny ridged tail, basking on a rock

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

Where
Coco town, Beaches, Your garden
When
Daytime, all year, basking from mid morning
Size
Up to about 1.3 metres including tail, males much bigger than females
Should I worry
Enjoy it
Harmless unless grabbed. Then it bites and whips with the tail, and both hurt.

You will meet the garrobo on your first walk to the beach and roughly every hour after that for the rest of your life here. Big, grey, prehistoric, and utterly indifferent to you until you get within about two metres, at which point it vanishes at a speed that seems unfair.

Where you’ll see it

Rocks, sea walls, roofs, roadsides, the beach, your garden wall. Anywhere with sun to bask in and a crevice to bolt into. Coco has an enormous population and they are as much part of the town as the dogs.

What to know

Adults are mostly vegetarian and spend the day soaking up heat. The young are greener and eat more insects. They are fast, and not by a little: this species holds the record for the fastest lizard measured, which you will believe the first time one takes off.

They do not chase, they do not bite unprovoked, and they are not a danger to anyone who leaves them alone. Catching one is the mistake. The bite is serious and the spiny tail is used as a whip. Dogs that learn this lesson tend to learn it once.

Questions people ask about this one

What is the big grey lizard on the rocks at the beach?

A black spiny-tailed iguana, called a garrobo locally. Adults are grey and black with a spiny tail and can be well over a metre long. They are everywhere on this coast and completely used to people.

Is the garrobo dangerous?

No. It is a plant eater as an adult and it wants nothing from you. The only way to get hurt is to catch one, which earns a hard bite and a whip from the spiny tail. Children and dogs should leave them alone.

What is the fastest lizard in the world?

This one. The black spiny-tailed iguana holds the record, clocked at around 34 kilometres an hour. You will see the evidence every time one decides you are too close.

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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