Invasive species

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Spiny water flea (Bythotrephes longimanus). Jake R. Walsh

Tiny flea reveals the devastating costs of invasive species

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.
Fallow deer are on the rise. Fallow deer image from www.shutterstock.com

Oh deer: a tricky conservation problem for Tasmania

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.
There’s nothing feral about this Australian wildcat. Photograph by Angus Emmott

Let’s give feral cats their citizenship

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.
Stoats (Mustela erminea), feral cats (Felis catus), red foxes (Vulpes vulpes) and black rats (Rattus rattus) are invasive predators in different parts of the world. Clockwise from top left: Sabec/commons.wikimedia.org (CC BY-SA 3.0); T Doherty; CSIRO/commons.wikimedia.org (CC BY 3.0); 0ystercatcher/Flickr (CC BY-NC-SA 2.0)

Killing cats, rats and foxes is no silver bullet for saving wildlife

Research published this week shows saving wildlife is much more complicated than killing introduced predators. Killing predators often doesn't work, and is sometimes actually worse for native wildlife.

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