Jussi Murtosaari / Sabine's gull (Larus sabini), adult in flight, Finland, September

Jussi Murtosaari / Sabine's gull Larus sabini), adult in flight, Finland, September

Ole Jorgen Liodden / Sabine's gull (Xema sabini) Svalbard, Norway, June.

Roy Mangersnes / Sabine's gull (Xema sabini) at lake edge, Lagoya, Svalbard, Norway, July.

Brent Stephenson / Sabine's gull (Larus / Xema sabini) adult in nearly full breeding plumage, off Madeira, North Atlantic. May.

Gerrit Vyn / Sabine gull (Larus / Xema sabini) Teshekpuk Lake Special Area, Alaska, USA July

Sandesh Kadur / Bengal monitor (Varanus bengalensis) smelling a stone with its tongue, Ranthambore National Park, Rajasthan, India. 2016.

Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016.

Yashpal Rathore / Bengal monitor (Varanus bengalensis) Tadoba National Park, India

Yashpal Rathore / Bengal monitor (Varanus bengalensis) basking on the tree, Jim Corbett National Park, India

Bernard Castelein / Common indian monitor (Varanus bengalensis), Keoladeo NP, Bharatpur, India

Andy Rouse / Bengal monitor (Varanus bengalensis) in tree looking out of hole, Ranthambhore, India.

Sandesh Kadur / Bengal monitor (Varanus bengalensis) smelling with its tongue, Ranthambore National Park, Rajasthan, India. 2016.

Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, one escaping and running away, Ranthambore National Park, Rajasthan, India. 2016.

Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016.

Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016.

Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016.

Ashish & Shanthi Chandola / Bengal monitor (Varanus bengalensis) at nest, Yala National Park, Sri Lanka, December