High in the eucalyptus trees of Australia, koalas (Phascolarctos cinereus) are often seen curled into tight, fluffy balls, barely moving for hours at a time.

There are so many koalas in some places that food is the issue – while elsewhere populations are threatened by habitat loss. And there are no easy fixes ...

The Associated Press on invasive species and flooding It's not as immediately noticeable as, say, fallen trees or washed away roads, but the spread of invasive species after floods may be just as ...