Pictures of the day

• 1/31 She's electric

  Japanese actress Suzu Hirose at an event in Tokyo to promote mobile phone carrier SoftBank's robots and their different business applications, such as retail, healthcare and education.

  AP Photo/Shizuo Kambayashi

• 2/31 Fire starter

  Longboat during the Up Helly Aa festival in Lerwick, Shetland Islands, celebrating the influence of Scandinavian Vikings in the islands

  AFP / Andy Buchanan

• 3/31 She's in fashion

  Armani's spring- summer 2016 Haute Couture collection in Paris

  AP Photo/Thibault Camus

• 4/31 Cover star

  Donald Trump signs a copy of Playboy at a Republican rally in Iowa

  Scott Olson/Getty Images

• 5/31 Pyramid formation

  Indian soldiers make formations on motorcycles as they roll down Rajpath during the Republic Day parade in New Delhi, India

  Bernat Armangue/AP

• 6/31 Sunrise over the London Eye

  Sunrise over the London Eye from horse Guards Parade

  Jeremy Selwyn

• 7/31 Going walkabout

  A transit police officer kneels next to a sloth holding on to the post of a traffic barrier on a highway whilst it was trying to cross the road. The animal was returned to it's natural habitat following an examination and clean bill of health by a Veterinarian

  Ecuador's Transit Commission/Reuters

• 8/31 Dawn breaking

  A woman walks her dog before sunrise on Whitley Bay beach, Tyne and Wear

  Owen Humphreys/PA

• 9/31 Large moon looming over Primrose Hill

  The moon casts an eerie glow over Primrose Hill as joggers take advantage of a fine morning

  Jeremy Selwyn

• 10/31 New crib on London's Southbank

  A luxury 35 foot treehouse, inspired by the South African destinations from Virgin Holidays has opened on London's Southbank. The public can visit every day this week and a lucky few can win an overnight stay

• 11/31 Fighting the fire of Isis

  Libyan oil workers try to extinguish flames at an oil facility in northern Libya's Ras Lanouf region after it was set ablaze following fresh attacks launched by Islamic State

  AFP/Getty Images

• 12/31 Head hunter

  Star Wars collector Darryll Jones, from Milton Keynes, is one of the attractions at an exhibition featuring some of the world's greatest collections at The Proud Archivist in London

• 13/31 Loopy

  Two pilots show off their skills at this year's Bahrain Air Show above Sakhir

  Hamad I Mohammed/Reuters

• 14/31 Lighting up the world

  The dancing lights of the Aurora Borealis is shown over the Pacific northwest taken from the International Space Station by astronaut Scott Kelly

  NASA

• 15/31 Ewoks let their hair down

  Carantonas pose during the Carantonas festival in Acehuche near Caceres in the southwestern Estremadura province of Portugal. Mixing paganism and Christianity the monster-animal like "Carantonas", a patchwork of sheep, cow, rabbit and goatskins under painted masks, search for Saint Sebastian in the streets of the village eventually congregating at the village church, for a procession with the statue of the patron saint

  Cesar Manso/AFP/Getty Images

• 16/31 Davos Dave

  David Cameron addresses the attendees during the session Britain in the World during the Annual Meeting 2016 of the World Economic Forum in Davos, Switzerland

  Ruben Sprich /Reuters

• 17/31 A helping hand cleaning up

  Aquarist Graham Banton cleaning the glass of the 750,000 litre Ocean display as part of Sea Life London Aquarium annual January clean up

  Mikael Buck/SEA LIFE London Aquarium/PA

• 18/31 Frosticles

  Frost on plants in fields around Glastonbury Tor, Somerset, as Britain awoke to another icy start

  Ben Birchall/PA

• 19/31 Getting your stripes

  Two Damara plains zebras put their heads together at the zoo in Duisburg, Germany, to combat the cold

  Roland Weihrauch/EPA

• 20/31 World Cancer Day

  Cancer survivor Abi, launches this year’s World Cancer Day campaign by helping to sort through over one million Unity Bands™, which are available from today. Join Cancer Research UK, Breast Cancer Care, Anthony Nolan and the Movember Foundation and show your support by wearing your Unity Band on 4 February 2016. www.worldcancerday.co.uk

  Oliver Dixon

• 21/31 Nippy Nelson's Column

  Nelson's Column is reflected in a thin layer of ice covering the fountains in Trafalgar Square

  Anthony Devlin/PA

• 22/31 A face only a mother could love

  A four week old Javan Gibbon clinging to its mother Belle as it makes its public debut at Port Lympne Wild Animal Park near Ashford in Kent. The as yet unnamed baby is the first of its species to be born at the park in six years

  Gareth Fuller/PA

• 23/31 An Orthodox mark of faith

  A woman takes a dip in a font on the eve of the Orthodox Epiphany in central Moscow. Orthodox believers mark Epiphany by immersing themselves in icy waters regardless of the weather

  Sergei Karpukhin/Reuters

• 24/31 Hot to trot

  A man rides a horse through a bonfire as part of a ritual in honor of Saint Anthony the Abbot, the patron saint of domestic animals, in San Bartolome de Pinares, Spain. Dozens ride their horses through the narrow cobblestone streets of the small village during the "Luminarias," a tradition that dates back 500 years and is meant to purify the animals with the smoke of the bonfires and protect them for the year to come.

  Francisco Seco/AP

• 25/31 Cold-eyed determination

  A sledding dog is covered in ice after spending the night in the open air with his musher at the polar base of Val-Cenis, as they ready for the next stage of the 12th edition of "La Grande Odyssee" sledding race across the Alps

  AFP/Getty Images

• 26/31 Milk Tray Man (or possibly Woman)

  An impressive 20,785 applicants have applied to become the new Milk Tray Man and after a very tough decision making process a lucky 33 made it through to the live auditions

  Rex

• 27/31 Cool tennis fan

  A woman cools off next to a fan on day one of the 2016 Australian Open tennis tournament in Melbourne on January 18

• 28/31 Just the ticket

  There were big queues outside the Adelphi Theatre in Strand in response to The Evening Standard ticket voucher campaign

  Glenn Copus

• 29/31 Wing it

  Georgina Barnes posing with a blue morpho butterfly on a floral hat made and designed by florist Emma Reynolds to celebrate the opening of "Butterflies in the Glasshouse" at RHS Garden Wisley near Woking, Surrey

  Luke MacGregor/RHS

• 30/31 Eat your veg and you will grow up big and strong

  Stephen Bruce, co-founder and owner of Serendipity 3, and Honor, the USA's smallest police horse in training, share Serendipity 3's Celestial Carrot Cake in New York

  Cindy Ord/Getty Images

• 31/31 On the levels

  The sun rises over the flooded Somerset Levels as colder weather and clearer overnight skies take hold across parts of the UK with frost and snow forecast

  Ben Birchall/PA