![](http://static.ddmcdn.com/gif/recipes/marsupial-200-140409.jpg)
An extinct marsupial hunter only the size of a fox may have hunted prey larger than itself.
![](http://static.ddmcdn.com/gif/blogs/dnews-files-2014-04-german-shepherd-kennel-250x.jpg)
When kenneled, a large percentage of dogs show behaviors
commonly associated with mental illness. Some even bounce off the walls
-- literally.
![](http://static.ddmcdn.com/gif/koala-tree--250x250.jpg)
The trees koalas prefer to sit in doesn't necessarily correspond to where they prefer eating.
![](http://static.ddmcdn.com/gif/recipes/killer-shrimp-and-other-invasive-species-travel-by-canoe-a-140409-200x200.jpg)
Damp canoes and fishing gear provide a route for invasive species to spread.
![](http://static.ddmcdn.com/gif/blogs/dnews-files-2014-04-Sonoran_desert_tortoise-SMALL.jpg)
Most reptile and bird species will lose chunks of their
homelands by 2099. Only a few will stay the same or gain.
![](http://static.ddmcdn.com/gif/recipes/520-million-year-old-fossils-had-heart-and-brain-140407-200x200.jpg)
An extinct arthropod, Fuxianhuia protensa, from the Cambrian
period, had a sophisticated heart and blood vessel system.
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