Ibiza's growing population of invasive snakes has attracted increasing attention in recent years, including reports of snakes appearing in rural areas, gardens and, occasionally, near the coast.

But for visitors wondering if the island's snake problem could turn a holiday into a health emergency, the available evidence points to a different reality.

The main invasive species established on Ibiza, the horseshoe whip snake (Hemorrhois hippocrepis), is non-venomous and is not considered dangerous to humans. The much more serious concern is its impact on Ibiza's native wildlife, particularly the endemic Pitiusan wall lizard, known locally as the sargantana.

More Than 4,400 Snakes Captured

The scale of the control operation is nevertheless significant.

According to the Balearic Government, more than 4,400 invasive snakes were captured across Ibiza and Formentera during the 2025 campaign.

On Ibiza, 3,604 snakes were captured using 1,930 traps, the highest number of captures recorded on the island since the control program began. Of those, 3,528 were horseshoe whip snakes.

On Formentera, 893 specimens were captured using 505 traps, with the majority identified as ladder or “white” snakes. The Government also recorded individual horseshoe whip snakes around La Savina, highlighting the continuing risk of movement between the islands.

The figures do not represent the total number of snakes living on the islands. They are animals captured through the official control program.

Why Are Authorities Catching Them?

The reason for the extensive trapping operation is environmental rather than human safety.

The horseshoe whip snake was introduced to Ibiza and has spread widely across the island. With few natural predators in its new environment, it has established itself as a significant predator of native reptiles.

The Pitiusan wall lizard is particularly vulnerable because it evolved in an island ecosystem without this type of snake predation.

The Balearic Government describes invasive snakes as one of the principal environmental threats affecting the islands and has increased both personnel and trapping resources as part of its control strategy.

The Control Program Has Expanded

Snake control in the Pitiusas began in 2016, when the operation was considerably smaller.

A June 2026 report from the COFIB field operation described almost 2,000 traps on Ibiza and more than 500 on Formentera. Since the beginning of the program, more than 22,000 snakes had been captured across the two islands, although the 2026 figure was not yet complete at the time of the report.

The Government also decided to keep trapping active throughout the year, including during the winter months, rather than limiting the operation to the period of greatest activity.

For 2026, the planned control operation includes 13 people dedicated to snake control across the Pitiusas, representing a 44 percent increase in human resources, together with further expansion of the trap network.

Environmental Groups Are Also Involved

The response is not limited to government agencies.

IbizaPreservation's “Protegim Ses Sargantanes” project has been operating since 2023 to help protect the Ibiza wall lizard by capturing invasive snakes.

During its 2025 campaign, the project captured 584 invasive snakes and expanded its work from protected natural areas into agricultural properties across the island. Since the project began, it has recorded 1,172 horseshoe whip snakes captured through its program.

Other environmental organizations, including Amics de la Terra and GEN-GOB, are also involved in efforts to protect the Pitiusan lizard and encourage residents to report snake sightings and participate in monitoring and control programs.

Can an Ibiza Snake Bite You?

Yes, a snake can bite if it feels threatened or is handled, but that is very different from saying Ibiza has dangerous venomous snakes.

The horseshoe whip snake is non-venomous. Recent reporting has documented volunteers being bitten while handling captured specimens, but those incidents have not involved venom poisoning.

For visitors, the sensible response is therefore not to approach, corner or attempt to handle a snake.

If a snake is encountered, keeping a safe distance and allowing it to move away is preferable to trying to pick it up.

Anyone who is actually bitten should seek medical advice, particularly if there is significant pain, swelling, an allergic reaction or uncertainty about the species involved.

Snakes Have Been Seen Near the Coast

One reason the subject has generated attention is that horseshoe whip snakes are capable swimmers.

There have been documented sightings of the species in the sea and near beaches, including reports of snakes swimming between islands and reaching small offshore islets.

That behavior can look alarming in photographs and videos, particularly when snakes appear close to swimmers.

However, the presence of a swimming snake does not mean that the animal is seeking out people. The principal concern remains its ability to reach areas inhabited by native lizards and other wildlife.

A Bigger Problem for Ibiza’s Lizards

For Ibiza's ecosystem, the situation is considerably more serious.

The Pitiusan wall lizard is endemic to the Balearic Islands and includes populations with highly distinctive genetic characteristics on individual islands and islets.

The spread of invasive snakes has already contributed to severe declines in some lizard populations, and authorities are increasingly focusing on protecting remaining populations as well as capturing snakes.

In April 2026, the Balearic Government announced additional conservation measures, including the creation of snake-free refuges for wall lizards and an ex-situ breeding program involving institutions including Barcelona Zoo.

What Should Visitors Do?

For tourists, the message is relatively straightforward.

There is no evidence that visitors should regard Ibiza as a destination with a significant snake-bite health risk. The principal invasive species is non-venomous, and encounters with snakes remain far less common for tourists than the large number of captures might suggest.

Visitors staying in rural properties should nevertheless avoid reaching into wood piles, dense vegetation or other places where a snake could be hiding.

If a snake is encountered, it should not be handled. A sighting can be reported through the established local channels so that authorities or wildlife personnel can determine the appropriate response.

The Bigger Story Is Biodiversity

Ibiza's snake problem is real, but it is primarily a conservation issue.

Thousands of invasive snakes are being captured each year, authorities have expanded the trapping operation and environmental groups are working alongside public agencies to protect the island's native lizards.

For holidaymakers, however, the available evidence does not support the idea that Ibiza's snake population represents a serious threat to human health.

The greater concern is what happens to Ibiza's unique wildlife if the invasive snakes continue to expand. That is why the island's snake-control program is being intensified, with trapping, monitoring, biosecurity and protected refuges now forming part of a broader effort to preserve the Pitiusan wall lizard.