The week in wildlife

Zurich, Switzerland: A chameleon sits on a tree at the zoo Photograph: Arnd Wiegmann/Reuters

Allahabad, India: A butterfly sits on a flower at the university botanical garden Photograph: Rajesh Kumar Singh/AP

Frankfurt Oder, Germany: A thistle in a meadow Photograph: Patrick Pleul/EPA

Hakone, Japan: Autumnal tress in one of Japan's most popular hot-spring resorts Photograph: Dai Kurokawa/EPA

Torvinen, Finland: Reindeers walk on a road early in the morning Photograph: Olivier Morin/AFP/Getty Images

Hamburg, Germany: Swans swim in a small lock after council workers rounded up them from Hamburg's inner-city lake Alster. Every year the swans are collected from waterways around the city of Hamburg and taken to winter quarters where they are fed and cared for until the spring Photograph: Christian Charisius/Reuters

Ghamadan, Jordan: A zebra looks at visitors from its cage Photograph: Ali Jarekji/Reuters

Bogor, Indonesia : A Humboldt penguin shakes off water at the Taman safari Photograph: Achmad Ibrahim/AP

Minsk, Belarus: A squirrel eats a nut in a park on the first snowy day of the winter Photograph: Vasily Fedosenko/Reuters

Farne Islands, UK: An otter paw print found on Brownsman. The otter has survived gale force conditions to make the 'perilous journey' to the Farne Islands for the first time Photograph: National Trust/PA

Hungary: A flock of migrating cranes fly over the puszta or Hungarian steppes of Hortobagy Photograph: Tibor Olah/AP

Doma, Zimbabwe: Vhukani Sibanda snaps the neck of a bird he caught to eat Photograph: Tsvangirayi Mukwazhi/AP

Serbia: A flock of griffon vultures (Gyps fulvus) on the rocks in the canyon of the Uvac river. The griffon vulture is the largest bird living in Serbia, and is a rare species of vulture eagle, of an impressive size and a wingspan of up to 3m. The average weight of a bird ranges between 8 and 9kg; some individuals can weigh 11kg Photograph: Jaroslav Pap/AP

Yongin, South Korea: A newborn sloth and his mother at a zoo. The sloth was the first born through natural breeding in South Korea Photograph: Yonhap News Agency/EPA

Yongin, South Korea: A lion cub warms himself with an electric heater at the Everland zoo, as temperatures dropped to this year's lowest level Photograph: EPA