Pete Oxford / Crimson-rumped Toucanet (Aulacorhynchus haematopygus) peeking out of nest hole, Intag Valley, northwest Ecuador

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

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

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