Ibiza’s iconic wall lizard (Podarcis pityusensis), endemic to the islands of Ibiza and Formentera, is teetering on the edge of extinction as it faces a dual onslaught of invasive snakes and human waste that threatens to unravel the island’s fragile ecosystem.

An Unintended Arrival Becomes a Deadly Threat

The trouble began in the early 2000s when the horseshoe whip snake (Hemorrhois hippocrepis) quietly made its way onto the island—hitchhiking in the roots of imported olive trees. Since then, the species has exploded in numbers, now occupying up to 90% of Ibiza’s territory. This rapid spread has coincided with a dramatic collapse of the wall lizard’s habitat—surviving in just 30% of the island.

Swimming Predators, Disappearing Lizards

Even the islets around Ibiza and Formentera—once safe havens—are no longer safe. These invasive snakes are now swimming across open water to colonize isolated territories.

By trapping efforts alone, authorities captured 2,710 snakes in 2022, 2,007 in 2023, and a whopping 3,072 in 2024, signaling an unrelenting and growing invasion.

A Ripple Effect on Ibiza’s Ecosystem

The decline of the wall lizard threatens much more than just a beloved local reptile. These lizards are vital for pollinating native plant species, controlling insect populations, and maintaining balance in the food web. Their disappearance is causing cascading ecological damage, including destabilization of populations of mice, birds, bats, and pollinators like insects.

Litter: A Deadly, Overlooked Enemy

The crisis isn’t limited to invasive snakes. Tourism hotspots littered with discarded bottles and cans are becoming literal death traps. Lizards frequently get stuck inside these containers; trapped, they suffer dehydration or heat trauma—often meeting a tragic fate.

Efforts to Protect and Preserve: A Race Against Time

Despite the grim outlook, Ibiza is fighting back. Conservation groups—including IbizaPreservation, GEN-GOB, COFIB, and Friends of the Earth Ibiza—are spearheading multiple initiatives:

Snake control through trapping: Widespread deployment of traps continues, with hundreds removed annually from both Ibiza and nearby Formentera.

Captive breeding programs: A pilot conservation program at the Barcelona Zoo recently housed 17 genetically diverse lizards captured from Ibiza and Formentera, nurturing them in captivity to maintain a safeguarded gene pool.

Refuges and public awareness: Projects like Marina Ibiza’s environmental initiative are providing safe shelters and installing snake traps within the marina, while also educating visitors to protect the lizards.

Community and citizen engagement: Visual surveys, citizen reporting (via apps like Línea Verde COFIB), and educational campaigns are helping locals and tourists alike contribute to conservation efforts.

Why It Matters Beyond a Lizard

The Ibiza wall lizard is more than a reptile—it is a cultural emblem and an essential part of Ibiza’s identity. Its disappearance would not only be an ecological loss but also a cultural one, erasing a living symbol of the island’s heritage.

What You Can Do

Come clean: Dispose of bottles and cans responsibly—your litter isn’t just unsightly, it can be lethal.

Stay aware: Report snake sightings to local authorities—every sighting matters.

Support conservation: Whether through donations, volunteering, or spreading awareness, every effort counts.

Ibiza’s wall lizard deserves every chance to survive. The fight continues—but time is not on our side.

Full original story at news.sky.com