(Portland, OR)  --  The Oregon Zoo is seeking volunteers to help track the Columbia River Gorge's Pika population.  The work is for a project called The Cascades Pika Watch, which aims to map out where the fluffy rodents make their homes in the region.  The zoo is offering a free crash course in May to help residents learn how to identify pikas.  Interested residents can visit the zoo's website for more information.