The week in wildlife

First-time mother Mjukuu, a western lowland gorilla with her newly born male baby – the first gorilla to be born there in 20 years – resting on straw in an enclosure at the London zoo Photograph: Iona Stewart/AP

Pandas play at the Bifengxia Base of China giant panda protection and research centre in Ya'an, China. Six giant pandas, named Hao Hao, Yun Yun, Jin Ke, Yin Ke, Bo Si and Shen Wei, are being sent to Xiangjiang safari park Photograph: ChinaFotoPress/Getty Images

A butterfly rests on a leaf at the National Institute of Biodiversity (INBio) in Santo Domingo de Heredia. Costa Rica won the Future Policy award 2010 in celebration of its biodiversity law as a milestone of excellence in meeting the goals of the UN Convention on biological diversity in Nagoya Photograph: Juan Carlos Ulate/Reuters

A king vulture at the La Esperanza ecological sanctuary in Ixtapaluca, Mexico Photograph: Sashenka Gutierrez/EPA

A green iguana (Iguana iguana) at the National Institute of Biodiversity (INBio) in Santo Domingo de Heredia, Costa Rica Photograph: Juan Carlos Ulate/Reuters

Two rescued Seal pups come together after being released into the wild off the banks of the River Nene at Sutton Bridge in Lincolnshire, by staff from the RSPCA East Winch rescue centre in Norfolk Photograph: Chris Radburn/PA

Birds feed from a deer at Bradgate park in Newtown Linford, England Photograph: Darren Staples/Reuters

Fluffy, a reticulated python at Columbus zoo and aquarium. Workers found Fluffy dead on Wednesday morning from an apparent tumour. The 18-year-old snake was 24ft long and 300 pounds and held the title of longest snake living in captivity by Guinness World Records Photograph: AP

Cranes make their way over a field in Germany. On their way from the wetlands of Russia, Scandinavia and eastern Europe, the migratory birds pause in eastern Germany's wetlands to rebuild their strength before continuing their journey to Africa and southern Europe, where they are wintering Photograph: Johannes Eisele/AFP/Getty Images

Fish covered by a net, during seining in a lake at Volma fish farm in Belarus Photograph: Sergei Grits/AP

Men cut a humpback whale after it was declared dead by veterinarians, on Geribá beach in Brazil Photograph: Sergio Moraes/Reuters

A butterfly in a flower in Los Angeles, California Photograph: Gabriel Bouys/AFP/Getty Images

A blue fang skeleton spider (Ephebopus cyanognathus). More than 1,200 new species have been found in the Amazon in past decade. A WWF report says a new species was discovered every three days from 1999-2009, from bald parrots to translucent frogs Photograph: Peter Conheim /WWF