For one of the smallest mammals, the sea otter can live its entire life without ever leaving the water. Sea otters are considered keystone species in their ecosystems, because they actually influence ... more 
For one of the smallest mammals, the sea otter can live its entire life without ever leaving the water. Sea otters are considered keystone species in their ecosystems, because they actually influence their environments. For instance, they eat sea urchins, which eat kelp in great abundance. When the sea urchins’ populations are controlled by sea otters, vital kelp forests can flourish. © Kevin Schafer / WWF-Canon
To learn more visit worldwildlife.org/arctic less 
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| Photo By © Kevin Schafer / WWF-Canon / © Kevin Schafer / WWF-Canon
Sun, Apr 15, 2012 8:17 PM EDT