Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Mary McDonald / Collared Pika {Ochotona collaris} gathering sticks for nest, Denali NP, Alaska, USA

Mary McDonald / Collared Pika {Ochotona collaris} Denali NP, Alaska, USA

Douglas Herr/ BIA / Collared Pika (Ochotona collaris), Alaska

Chase Dekker / Collared Pika (Ochotona collaris) feeding on grass, Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris) carrying flowers, Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), North America

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris) browsing, Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris) feeding on vegetation, Denali National Park, Alaska

Matthias Breiter / Collared Pika (Ochotona collaris) with fireweed stalk, Alaska

Michio Hoshino / Collared Pika (Ochotona collaris), Alaska

Donald M. Jones / Collared Pika (Ochotona collaris) carrying leaf, Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Donald M. Jones / Collared Pika (Ochotona collaris) in defensive posture, Denali National Park, Alaska