Avocet (Recurvirostra avosetta) feeding in shallow water. Shorebirds disperse propagules by gut passage (endozoochory), and their migratory movements facilitate long-distance...

A male willow ptarmigan (Lagopus lagopus) in winter plumage, well camouflaged in the snow. In the Fennoscandian mountain tundra, ptarmigan is a medium-sized alternative prey to...

Didelphis aurita (big-eared opossum, Brazilian common opossum) occurs in the Atlantic Forest coast of Brazil, to east of the lower Rio Paraguay and northeastern Argentina. This...

A turkey vulture Cathartes aura, perched on a branch. Turkey vultures locate carrion with their excellent vision and sense of smell and are daytime foragers due to their...

Species communities in the tropical mountain forests of southern Ecuador are among the most diverse worldwide and many species interact with each other. One example for these...

An adult guanay cormorant (Phalacrocorax bougainvillii) at nest with its three half-grown chicks. The guanay cormorant was by far the most abundant breeding seabird in Peru...

View of the canopy from the ground at the George Lake Permanent Sampling Plot in a mixedwood boreal forest of central Alberta (Canada). This mosaic is composed of photographs taken at...

A reflection of the sky on the wide black water Negro River, the main north bank tributary of the Amazon River, which is a barrier to gene flow between vertebrates found on the Guiana...

Caves are excellent natural laboratories for the study of global changes in environment because of their remarkable ecological and thermal stability. The principal mechanisms underlying...