Insects & arachnids

Bark scorpion

Centruroides species

A slender pale brown bark scorpion with long thin pincers and a raised tail, on a wooden surface

Photo: Charles & Clint · CC BY 2.0 · via Wikimedia Commons

Where
Your garden, Coco town
When
Night, all year, indoors more in the dry season
Size
Around 5 to 8 cm
Should I worry
Keep your distance
A painful sting, like a bad wasp with numbness after. Costa Rican species are not usually dangerous to healthy adults. Seek care for small children or any trouble breathing.

Everyone who lives here has a scorpion story, and almost all of them end with a swollen hand and a good lunch anecdote rather than a hospital. Still, this is the animal that changes your habits: you will shake out your shoes for the rest of your life.

Where you’ll see it

Indoors and out. Under bark, in woodpiles, behind pictures, inside shoes and folded towels, and occasionally in the bed. They come inside more in the dry season looking for moisture, and they are nocturnal, so the classic encounter is a bare foot in the dark.

What to know

The sting is the point of the animal and it is effective: sharp pain at once, then a spreading ache and often numbness or a tingling that can last a day. That said, the scorpions of this region are far less dangerous than their notorious relatives further north. A healthy adult treats it with ice, a painkiller and swearing.

Take it seriously for small children, for the elderly, and for anyone who has trouble breathing or shows an allergic reaction. Those cases get a doctor, promptly. For everyone else, the defence is habit: shoes shaken, towels shaken, bed checked after a trip away, and a UV torch by the door for the evenings when you want to know exactly how many are on the wall.

Questions people ask about this one

Are scorpions in Costa Rica dangerous?

The species found in Guanacaste give a sting that hurts a great deal and can leave numbness or tingling for a day, but they are not in the same league as the dangerous scorpions of Mexico or North Africa. Healthy adults recover without treatment. Small children, the elderly, and anyone with breathing difficulty or an allergic reaction should be seen by a doctor.

How do I keep scorpions out of the house?

Seal gaps under doors, keep firewood and clutter away from the walls, shake out shoes and towels before use, and check the bed if you have been away. A cheap ultraviolet torch makes them glow bright green in the dark, which is oddly satisfying.

Wondering what else is out there?

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