Wild horses, known as brumbies, in Australia.
From 30,000-year-old cave paintings to The Man From Snowy River, wild horses have always been part of human culture. As Australia debates what to do with 'brumbies' in mountain environments, it's time to reconsider their place.
Japanese vessel washed ashore on Long Beach, Washington being inspected by John Chapman.
As well as thousands of deaths and huge destruction, Japan's 2011 tsunami carried potentially invasive species _en masse_ across an entire ocean.
Bacteria cultured from a sample of air in a public building.
When jetting off on holiday, we rarely give a second thought to what microbes we might be taking with us. But humans spread trillions of bacteria around the globe, potentially harming ecosystems' balance.
Invasive pine trees in the Western Cape have affected lizards causing their numbers to drop significantly.
Invasive plants have an impact on native species and unless these factors are properly understood, it is difficult to predict what sort of impact invasive plants will have.
The aquatic weed water hyacinth is causing major problems in Ethiopia’s Lake Tana.
Lake Tana in Ethiopia has been massively affected by the invasive weed, water hyacinth. Control methods are available but there are challenges.
Guam’s trees are struggling without the birds that spread their seeds.
Guam's trees are in trouble, thanks to the accidental release of a snake species 70 years ago, which has killed off many of the bird species that are vital for the health of the island's forests.
Gene drives aim to deliberately spread bad genes when invasive species such as mice reproduce.
Colin Robert Varndell/shutterstock.com
Releasing just 100 mice carrying a faulty gene designed to stop them reproducing can remove an entire population of 50,000, a new study shows, paving the way for new eradication efforts.
Feral pigs are found in every state and territory in Australia.
Swine brucellosis is spreading from Queensland into New South Wales. It's carried by feral pigs and poses a real risk the people and dogs that hunt them.
Invasive frogs can have a major impact on the environment. Some move continents by human trade or travel. But determining how to control them can lead to policies that limit their spread and effects.
Giant African land snails can grow up to 15cm long.
There's a terrifying species that spreads rapidly, breeds prolifically and eats hundreds of plants. But the first research into the actual harm caused by giant African land snails found ... not much.
Managing trout is a contentious issue with conflicting views about whether they pose a risk, or are beneficial.
Regulating species in South Africa is difficult. But identifying those creating the greatest tension, would shift focus on the most destructive species.
Red-eared sliders were once popular pets but are currently banned in Australia. These turtles are still regularly found in the wild and being kept as illegal pets.
Exotic pets may rank highly on the novelty and excitement scale, but little is known about their ownership in Australia.
The American red swamp crayfish was intentionally introduced to parts of Africa to control snails and as a pet.
Developing countries have been slow to react to the alien species problem. Its impact can be massively reduced if policies are developed to deal with the issue.
A National Park Service staffer applies herbicide to invasive honeysuckle along the Natchez Trace Parkway.
Most of the earthworms in the US Northeast and upper Midwest are nonnative species. Scientists are finding increasing evidence that invasive worms and invasive plants may help each other.
The larger grain borer beetle attacks crops like maize and cassava, threatening food security.
Many alien plants and animals have been introduced to Africa from other regions and spread from country to country, often having devastating effects.
Prickly pear is a type of orphan crop.
Africa's orphan crops are under-researched and underutilised. They can be a vital tool in combating food and nutrition insecurity on the continent.
Partula snails were driven to extinction in the wild by introduced predators.
Before we decide to eradicate or control an invasive species, like carp, we need plenty of scientific evidence and independent assessments first.
Pisgah National Forest, North Carolina.
Forests are valuable for many uses, including timber, clean water, wildlife habitat and recreation. Stresses on U.S. forests include wildfires, pest invasions and development of private lands.
Jacek Wojnarowski / shutterstock
Super-fertile slugs from the continent have bred with their cousins in the UK.
Hundreds of thousands of crown-of-thorns starfish have invaded North Queensland, devastating reefs.
New research has uncovered a whole new way to combat the devastating crown-of-thorns starfish, by decoding the pheromones that they use to communicate.