Color halftone Union Pacific Railroad Pictorial Post Card showing the rare white-tail Kaibab squirrel (Sciurus aberti kaibabensis) -- endemic to the Kaibab Plateau on the North Rim of the Grand Canyon. The squirrel, with its distinctive russet body, dramatic pure-white tail, and tufted ears, is posed alert on a lichen-covered log branch, with pine boughs visible at left against a pale blue sky.

• Caption: "White-Tail Kaibab Squirrel, Kaibab National Forest, Arizona -- Reached via Union Pacific Railroad"
• Card no.: 122325
• Publisher: Union Pacific Railroad (Pictorial Post Card series)
• Postmark: Train RPO cancel, TR14, Sep 3, 1938
• Status: Posted