Invasive species bullfrog and snake cost world $16bn - study

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Two species are responsible for more harm than any other, according to a study by scientists.

Since 1986, the American bullFrog and brown tree snake have caused over $13 billion in global damage.

In addition to harm to the environment, the invaders have wreaked havoc on farms.

The researchers hope that more investment will be made to help block invaders.

The scientists held the brown tree snake responsible for $10.3 billion worth of damage due to its uncontrollable spread across several Pacific islands.

In Guam, where the reptile was introduced by US marines last century, the snake's population causes mass power cuts because they slither over electrical wires.

One estimate puts the population of Guam's jungle at as many as 20 inhabitants per acre.

Invasive species pose a greater threat of extinction to native animals and fauna when they are found on the island.

Image source, Getty Images

In Europe, the number of American bullFrogs has exploded.

Frog-proof fencing has been installed around known breeding sites in order to prevent the spread of the amphibian.

The EU study found that fencing off just five ponds would cost German officials 270,000.

The bull Frog is said to be eaten by the amphibian.

The common coqui frog is believed to have caused economic damage by triggering a decline in property values in the areas where they are found.

The study's authors hope their findings will encourage officials to invest more in pest control.