A researcher with holds a coqui guajón or Puerto Rican rock frog (Eleutherodactylus cooki) in a tropical forest in Patillas, Puerto Rico. Taken from the week in wildlife - our team’s pick of nature photographs from around the world.

Photograph:

Ricardo Arduengo/AP

A bear stands in front of a steaming geyser in the Valley of the Geysers of Kronotsky Zapovednik, Russia. From this week’s wildlife - in pictures Photograph: Igor Shpilenok/Barcroft Media

A bear stands in front of a steaming geyser in the Valley of the Geysers of Kronotsky Zapovednik, Russia. From this week’s wildlife - in pictures Photograph: Igor Shpilenok/Barcroft Media

Five shark species win protection against the finning trade, after the 178 nations at the world’s biggest wildlife summit voted to crack down on the trade.

The fins of the scalloped hammerhead are among the most valuable of all and it is estimated that 2 million a year are killed.

Photograph: Chris Newbert/Corbis

Common pesticides ‘can kill frogs within an hour’

New research suggests the chemicals are playing a significant and previously unknown role in the global decline of amphibians

Photograph: Peter Lilja/Getty Images

Big picture: Starlings, by Paolo Patrizi

Each week, the Guardian Weekend magazine’s editorial team choose a picture, or set of pictures, that particularly tickle their fancy. This week, their choice is Paolo Patrizi’s photographs of starlings

Photograph: Paolo Patrizi

A new species of primate, a “big-eyed” and venomous slow loris, has been identified in Borneo by researchers. But the new loris is already under threat from the Asian pet trade in part because its “teddy-bear face” make it attractive for illegal poaching, the team of UK and US scientists said.

Photograph: Duke Lemur Center / David Haring / Ch’ien C Lee

A snake snatches a tree frog in the banana trees in Jombang, East Java. Indonesia

Taken from picture desk: live, our daily blog of the best news images from the UK and across the world.

Photograph: Syaiful Arif/Rex Features

Hello leopard!

Curious hares, combative bears and creative bowerbirds feature among the winning images of this year’s BBC Wildlife camera-trap competition. This picture, taken in China by Zhou Zhefeng, was the animal portraits and overall winner. Sensitive, affordable digital camera-traps have become one of the most important tools for field researchers, multiplying the eyes of scientists and conservation workers.

Photograph: Zhou Zhefeng/BBC Wildlife Magazine

Before we get fully into election mode. Take a look at some of these stunning shots from the

  1. Mammals runner-up: Ole Jørgen Liodden, Norway. Photograph: Ole Jørgen Liodden/2012 GDT European Wildlife Photographer
  2. Other animals category runner-up: First kiss by Klaus Tamm, Germany Photograph: Klaus Tamm/2012 GDT European Wildlife Photographer
  3. Underwater world winner: The pursuit by Cristobal Serrano, SpainPhotograph: Cristobal Serrano/2012 GDT European Wildlife Photographer
  4. Birds highly commended: Back front back by Jerome Guillaumot, France Photograph: Jerome Guillaumot/2012 GDT European Wildlife Photographer
  5. Photograph: Overall winner: The Stargazer by Tommy Vikars, Finland Tommy Vikars/2012 GDT European Wildlife Photographer