Jun 3 2012: Beavers terraform landscape and waterways for their long term multi-generational benefit. This also benefits many other species who thrive in ecosystems built and maintained by beavers. They do this work with intent. Of course it could be argued that they are not conscious of the pros & cons their actions have on their local environment as a whole, yet neither do we. Just as they do, we terraform for our own benefit, but is that not natural behavior? Animals are not the only life forms who alter their environment in ways that benefit more than their own and/or intended.
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A comment on Conversation: Are there any examples in nature of an animal that knowingly seeks to conserve the environment in some way?
Plants: http://www.cbc.ca/natureofthings/episode/smarty-plants-uncovering-the-secret-world-of-plant-behaviour.html
Fungi: http://www.ted.com/talks/paul_stamets_on_6_ways_mushrooms_can_save_the_world.html
More: http://www.youtube.com/watch?v=BelfLIJErek