An aerial view shows a car driving along a forest road during sunset in the Siberian Taiga area outside the village of Balakhta, in Krasnoyarsk region, Russia January 5, 2018. REUTERS/Ilya Naymushin
A building covered in ice sits at the base of the Horseshoe Falls in Niagara Falls, Ontario, Canada, January 2, 2018. REUTERS/Aaron Lynett
A snow-covered pier is seen on a lake near the village of Etyek, Hungary, January 14, 2018. REUTERS/Bernadett Szabo
An aerial view shows men fishing on thin ice covering the Yenisei River outside Krasnoyarsk, Russia January 2, 2018. REUTERS/Ilya Naymushin
A snowboarder walks on the Peak Walk bridge at Glacier 3000 in Les Diablerets, Switzerland December 20, 2017. REUTERS/Denis Balibouse
A lone visitor takes a picture near the brink of the ice covered Horseshoe Falls in Niagara Falls, Ontario, Canada, January 3, 2018. REUTERS/Aaron Lynett
An aerial view shows employees working on fishponds for trout and sturgeon at a fish farm owned by Maltat company on the frozen Yenisei River near the Siberian village of Primorsk in Krasnoyarsk region, Russia January 3, 2018. REUTERS/Ilya Naymushin
Snow-covered trees are seen outside Tbilisi, Georgia, January 16, 2018. REUTERS/David Mdzinarishvili
An aerial view shows boats, moored on the bank of the Yenisei River in the Siberian Taiga area outside Krasnoyarsk, Russia December 18, 2017. REUTERS/Ilya Naymushin
A commuter climbs stairs during a morning snowfall in Lausanne, Switzerland December 18, 2017. REUTERS/Denis Balibouse
A man takes a photo in Central Park as the snow falls during a pre-winter storm in New York City, December 9, 2017. REUTERS/Brendan McDermid
Strong winds blow snow on a ridge in Adelboden, Switzerland January 6, 2018. REUTERS/Stefan Wermuth
Visitors sledge at Solomon's Temple after snowfall in Buxton, Britain December 29, 2017. REUTERS/Darren Staples
The Aurora Borealis (northern lights) illuminate the sky of Lapland region, in Inari, Finland, December 25, 2017. LEHTIKUVA/Irene Stachon/via REUTERS
Alexander Yaroshenko, a member of the Cryophile winter swimming club, rubs himself with snow after swimming in the Yenisei River in the Siberian city of Krasnoyarsk, Russia December 4, 2017. REUTERS/Ilya Naymushin
Afghan men play cricket on a field covered in snow on the outskirts of Kabul, Afghanistan December 16, 2017. REUTERS/Mohammad Ismail
A snow-covered chapel is seen after the first snowfall of the season in the western Austrian village of Tulfes, Austria, November 7, 2017. REUTERS/Dominic Ebenbichler
A warning sign reads "beware of icicles" beside snow and ice covered trees near a street towards the Feldberg mountain, outside Frankfurt, Germany, December 19, 2017. REUTERS/Kai Pfaffenbach
The snow covered village of Absam is pictured in front of Bettelwurf mountain, Austria December 19, 2017. REUTERS/Dominic Ebenbichler
A car is seen behind snow-covered trees outside Tbilisi, Georgia, January 16, 2018. REUTERS/David Mdzinarishvili
A murmuration of starlings dance in the sky.
Mountain gorillas are under threat from poaching, war and habitat loss in Rwanda.
Rescue boats resume their search in choppy waters for any survivors from the stricken Iranian oil tanker that collided with a freight ship and burst into...
Heavy fog cancels flights in Belfast.