The engineering of the new exhibit is pretty amazing.
 
“State-of-the-art engineering allows the new penguin exhibit to help
us reduce our environmental footprint. The plant roots and microbes in
a “constructed wetland,” similar to a natural wetland, will filter the
penguin pool water as it becomes dirty, or nutrient-rich (think
feathers, fish and poop!). This natural filtration system will return
purified water to the penguin pool. This means a pristine water
environment for the penguins and no pollution entering our lakes,
streams or Puget Sound. One-hundred feet below the exhibit, deep tubes
will use the earth’s thermal reserves to maintain the penguin pool at
the birds’ ideal water temperature of 50-60 degrees—-heating it in
winter and cooling it in summer. It’s only natural”
 
http://www.zoo.org/penguins/details.html

Posted from JaxonBrooks.com