I hike up to near the top of Mt Nieras in Stora Sjöfallet National Park in northern Sweden, March 2019. You can see as far as Saltoluokta in this picture. Strong winds forced me to turn back quite near the top.

A huge wave of northern lights – Aurora borealis – stretches all the way over my head in Norrbotten in northern Sweden. February 2019.

A sambar deer says Hi in India during sunrise, January 2013.

One of the favelas in Rio de Janeiro in Brazil, October 2015.

The Asiatic lion in India’s Gir Forest is the only remaining population of the lion outside of Africa. December 2012.

A red fox approaches as I sit and wait near sunset in northern Sweden, June 2011.

A grey wolf (Canis lupus) is being fitted with a radio collar in western Sweden in early 2003. The wolf is highly endangered in Sweden with a small population that is highly inbred.

Two great grey owl (Strix nebulosa) chicks sit at a log in the forest in Värmland, Sweden. This is the first recorded case of the great grey owl breeding in Värmland.

Lightning strikes in western Sweden.

Sometimes moss and lichens form small islands on the vast bogs of Dalarna in Sweden.

A small chick guards the stairwell as I go up a bird-watching tower to scout for black grouse.

Irbis the snow leopard (Panthera uncia) sneaks up on me as I pass by his enclosure in the morning sun. The photo is taken at Nordens Ark in Sweden.

We are out on Sweden’s largest lake, Vänern, putting up ultrasound recorders to see presence of bats. A large paper factory is seen in the background, one of Sweden’s major industries.

Sweden by air in winter. This is from a helicopter census of moose in Dalarna in 2010.

Spiterstulen in Norway near Scandinavia’s highest peak, Galdhöpiggen.

Mikael and Anders look at the map during a field trip to an alpine mountain in Jämtland, Sweden.

A moon-like landscape opens up in front of us as we begin putting up the tent at Sonfjället in Jämtland, Sweden.

Frost.

Mareike films the landscape of Benfontein nature reserve in South Africa as a rain cloud passes by.

Sunset in Benfontein nature reserve in South Africa.

A pine tree in the area near Doñana national park in southern Spain. Doñana is the home to one of the last populations of the highly endangered Iberian lynx.

A Bengal tiger (Panthera tigris tigris) walks past our jeep as the sun is about to set in Bandhavgarh national park, India.

A girl practices poi on the beach as the sun sets in Goa, India.

A very rare picture of a black-footed cat (Felis nigripes) kitten taken in Benfontein nature reserve. This cat is one of the least studied species of cat in the world.

The sun sets in Kruger National Park in South Africa.