Tui De Roy / Stewart Island Brown Kiwi or Southern Tokoeka (Apteryx australis lawryi), female probing by scent for sand hoppers in rotting kelp beach wrack at night, Ocean Beach, Stewart Island, New Zealand

Christophe Courteau / Pack of African wild dogs (Lycaon, pictus) smelling a scent on a trail, Mala Mala Game Reserve, South Africa, June.