David Gallan / Lace monitor (Varanus varius) sensing with tongue, New South Wales, Australia, December.

Franco Banfi / Couple of Pink River dolphin / Boto (Inia geoffrensis) Acajatuba Lake, Negro River, Amazonas, Brazil

Cyril Ruoso / Komodo Dragon (Varanus komodoensis) using tongue to smell, Komodo National Park, Indonesia

Michael Durham / Wild Puma (Cougar, Mountain lion) photographed with motion sensing camera at night. Oregon USA

ZSSD / Gila Monster (Heloderma suspectum) sensing with tongue, venomous species native to southwest United States and northern Mexico

Richard Du Toit / African Elephant (Loxodonta africana) bull sniffing with its trunk, summer, Chobe National Park, Botswana

ZSSD / Burmese Python (Python molurus bivittatus) sensing with tongue, native to China and Indonesia

Heidi & Hans-Juergen Koch / Colubrid Snake (Elaphe sp) two making initial contact, using tongue (Nasovomeral sense) to identify friend, enemy, or prey

Jim Brandenburg / Western Rattlesnake (Crotalus viridis) in defensive posture, South Dakota

Morley Read / Slow motion clip of a Tropical flat snake (Siphlophis compressus) sensing with tongue, Orellana Province, Ecuadorian Amazon. (non-ex)

Morley Read / Slow motion clip of a Tropical flat snake (Siphlophis compressus) sensing with tongue, Orellana Province, Ecuadorian Amazon. (non-ex)

Morley Read / Tropical flat snake (Siphlophis compressus) sensing with its tongue, Orellana Province, Ecuador. (non-ex)