Pikas have distinct calls that vary in duration. The call can either be short and quick, a little longer and more drawn out, or long songs. The short calls are an example of geographic variation. The pikas determine the appropriate time to make short calls by listening for cues for sound localization.
 
 A classic snapback with a polyester mesh back.
 
 • 100% front/100% polyester mesh back
 • 5 panel 
 • Seamed front panel with full buckram
 • Pro stitch on crown
 • 4 embroidered eyelets
 • 8 rows stitching on flat visor
 • Gray undervisor
 • Plastic snap closure