White-tailed ptarmigan The species name "leucura" was for a long time misspelt "leucurus", in the erroneous belief that the ending of "Lagopus" denotes masculine gender. However, as the Ancient Greek term "λαγωπους" is of feminine gender, and the species name has to agree with that, the feminine "leucura" is correct. The species name "leucura" is derived from the Latinized version of the Greek "leukos", meaning "white" and "oura", meaning "tail", in reference to the bird's permanently white tail. The white-tailed ptarmigan is the smallest of the ptarmigans and the smallest bird in the grouse family. It is a stocky bird with rounded
Rock ptarmigan the Russian High Arctic overwinters during the polar night and survives by feeding on rich vegetation on and underneath high cliffs where seabird colonies are located in summer.<ref name="FJL/">Dinets, V. (2001) Winter ecology of Willow Ptarmigan "Lagopus lagopus" and Rock Ptarmigan "L. mutus" at the northern limit of their range. "Ornitologia" 29: 326-327 (in Russian with English summary).</ref> During the last ice age, the species was far more widespread in continental Europe. The rock ptarmigan feeds primarily on birch and willow buds and catkins when available. It also eats various seeds, leaves, flowers, and berries of other plant species. Insects