Not every critter instinctively understands how to use a cat flap:

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But Ruby, an orphaned baby wombat adopted by an Australian family, is pretty quick to pick it up:

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[youtube=http://www.youtube.com/watch?v=J58a3Wg4hTs]

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Bonus: Here’s a video of Ruby playing with a dog that is, if anything, even more adorable:

[youtube=http://www.youtube.com/watch?v=PZaMmksySyQ]