Beeches are 'non-native' to Scotland because they got there less than 7,000 years ago. No, really.
Two recently emerging viruses in domestic pigeons in Australia may pose a significant threat to Australia's 22 species of native pigeons and doves, many of which have crucial ecosystem roles.
Is providing birds with food and water making them too dependent? Or are gardens just the new frontier of Australia's urban landscape? New research aims to find out.
At least 100,000 insects are among the many Australian species still to be formally identified. That's a problem for any biosecurity experts who need to be able to spot potentially invasive bugs.
Computer modelling can help predict where a species will best survive, especially those affected by climate change.
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.
Australia's risks losing its valuable native plants that could help solve a global food problem. So do we need new laws to stop the seeds being taken overseas?