Graphic pictures have emerged of a python feasting on a freshwater crocodile in a murky swamp in Australia's north. The images were posted on the GG Wildlife Rescue Inc social media page after Martin Muller stumbled on the incredible scene. Mr Muller saw the olive python, Australia's second largest snake, devouring an Australian freshwater crocodile while kayaking in Queensland's Mount Isa.

Dirk-Jan Steehouwer, 48, who is from The Netherlands, was at the Murchison Falls National Park in Uganda photographing a troop of monkeys when a giraffe strolled into the frame. For one brief moment a primate sitting in a tree appeared to be sitting on the giraffe's back instead, and thanks to Mr Steehouwer's quick reactions he was able to capture this image. He said: 'This is what I do it for, fantastic moments when nature keeps on surprising me and motivating me to go back and back.'

The inquisitive polar bear was spotted exploring the Russian Delta IV class submarine (left) which is thought to have been patrolling north of the Norwegian islands of Svalbard and Jan Mayen. All 120 sailors on board were told to stay below deck while the 65stone bear had a look (right top and bottom) around their vessel. It is thought that the sub had surfaced through the ice to dump some rubbish and the hungry polar bear came over to try and find some food.

American photographer Alex Suh (inset) has travelled to the Banco Chinchorro reef, in Mexico, three times in the past three years to get into the waters and capture the crocodiles in their natural habitat. The pictures, taken in July, show the photographer just inches away from the carnivorous crocs who seem more than happy to pose for the camera. Alex, who works in shark conservation and is the founder of Save My Fin, is a strong believer that humans and wild animals can co-exist and that crocodiles are not automatic killers. The American crocodile can only be found within the US in Florida and has experienced a resurgence after nearly disappearing from the state entirely during the 1970s.

Photographer Ken Kiefer took a two-hour boat ride with his wife, Kimber, and another model Melodie Trevino to reach the carnivorous beasts at Chinchorro Banks in Mexico. To avoid the need for trick photography - and any of the crocs getting snap happy - the photographer brought along safety divers who can be seen in some of the shots. Explaining his crazy idea, Mr Kiefer, 49, said: 'Kimber and I were thrilled to be able to finally get in and create images with these magnificent predators. It is one of those places whose sheer beauty and immensity is overwhelming.'

Dramatic photographs have emerged revealing the moment a lion leaps high into the air to sink its teeth into the neck of an adult giraffe in a coordinated ambush. A pair of lions worked in tandem to tire out the bull giraffe before eventually taking it down and suffocating it in a nature reserve spanning Botswana and South Africa. The incredible pictures were taken by wildlife photographer Vincent Grafhort who said he was surprised to see the lions target an adult giraffe in an attack that lasted half an hour.