An amazing glass frog in Costa Rica

Territorial response of a male great tit to a speaker broadcasting an intruder song

Female Dendropsophus ebraccatus in Costa Rica

A blue tit nest, from studies of bird cognition and breeding in County Cork, Ireland

Leptodactylus pentadactylus, the smokey jungle frog

Studying cognition in wild songbirds in the famous Wytham Woods

Bullfrog in Missouri

Mating pair of Hypsiboas rufitelus at La Selva, Costa Rica

Red eyed treefrogs, Agallychnis callidryas, in Costa Rica

Cantarrana (singing frog) swamp, La Selva, Costa Rica

Cruziohyla calcarifer at La Selva, Costa Rica

Protecting birdfeeders from squirrels for cognitive testing in the wild.

Killarney National Park, field site for songbird cognition studies

Grasshopper collection site in Germany

Common frog spawn in County Cork, Ireland