Linen-era Union Pacific Railroad promotional postcard featuring the Kaibab squirrel (Sciurus kaibabensis) — the rare, white-tailed subspecies endemic to the Kaibab Plateau on the North Rim of the Grand Canyon. The squirrel is shown in profile on a pine branch against a vivid blue-green sky, its brilliant white fan tail fully spread, with characteristic tufted ears and russet body. The card is from the Union Pacific Railroad "Pictorial Post Card" series promoting travel to the Grand Canyon North Rim via Union Pacific.

• 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
• Status: Unposted