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Transport, climate change and environmental destruction mean all sorts of species are bumping into each other for the first time.
Antarctica’s delicate ecosystem could be under threat from invasive species.
A warming Earth could see invading species arrive in Antarctica via the floating "taxi service" of the sea. That could be a threat to the southern continent's delicate ecosystem.
Kangaroos are much lighter on the land than sheep and cows.
Kangaroo image from www.shutterstock.com
Eating cows and sheep is unsustainable. Here are some better alternatives.
Rats are true natives of our cities.
Rat image from www.shutterstock.com
Rats have lived with us for thousands of years.
Goldfish might look nice, but they can also spread a variety of decidedly not-nice viruses.
Many pet fish end up in ponds, fountains and waterways. But before ditching your goldfish in the park, stop and think about the viruses you could also be releasing.
Moo-ve along: livestock are one of many threats to Australian freshwater ecosystems.
Freshwater covers only 0.5% of the Earth's surface but is home to 10% of the world's lifeforms.
Ash accounts for 20% of the UK’s trees.
www.shutterstock.com/Phil MacD Photography
Over 100 species are dependent on Ash trees for survival – we need to act fast.
The Northern Corroboree frog is among seven species at grave risk from fungal disease.
Chytrid fungus has already wiped out six species of Australian frogs since the disease arrived in the 1970s. Without urgent action, seven more are facing extinction.
Spiny water flea (
Jake R. Walsh
Invasive species cause some $120 billion in damages across North America yearly -- and that's just direct costs. A study of one species in one Wisconsin lake indicates the real toll is much higher.
A native Australian gecko, Gehyra dubia.
If you're hearing a strange chatter in your home, you may have gecko housemates.
Annoying, right? A juvenile Noisy Miner.
Andrew Haynes/Wikimedia Commons
There are birds we love to hate, such as the Noisy Miner. But much of the annoying behaviour on show may be a result of human-induced changes to habitats.
The numbat, Australia’s equivalent of a meerkat, is one of the unique mammal species confined to the south west.
Sean Van Alphen
South west Australia is home to an astonishing number of plants and some of the country's weirdest wildlife. Now we need to protect it.
A Japanese fish found in Washington after hitching a ride in a boat sent across the Pacific Ocean by the 2011 tsunami.
The 2011 Japan tsunami illustrates how more marine creatures are crossing the oceans than ever before - and not all of them are friendly travellers.
Fallow deer are on the rise.
Fallow deer image from www.shutterstock.com
There are now six species roaming wild, and their numbers are increasing dramatically as their population expands and through human action. As they spread, they raise uncomfortable issues for conservation.
Jelly invasion: is this a vision of the future for our oceans?
We know a lot about the potential negative effects of ocean acidification on marine creatures. But might some species actually benefit? The answer is yes, but this isn't necessarily a good thing.
Small birds such as this superb fairy-wren can benefit from a bird-friendly garden.
Wren image from www.shutterstock.com
Some Australian birds are pushing out other species, and even damaging trees. The good news is we can help stop the spread of these birds, by putting native plants in our gardens.
Small but dangerous – and coming to the New World.
A small invasive fish known as the topmouth gudgeon has already wreaked havoc on European species and its arrival to the US and South America is only a matter of time.
The continent's ice caps are melting, and both native and alien species will soon colonise the newly uncovered areas.
Eucalyptus trees in plantations are particularly vulnerable to pests.
Invasive pests threaten the world's much-needed planted forests, as trees are declining.
There’s nothing feral about this Australian wildcat.
Photograph by Angus Emmott
There's been a lot of talk about killing feral cats, with the government's recently announced war on cats, with a goal to kill two million by 2020. But let's embrace cats as part of Australia's environment.