A British teenager has won this year's Young Wildlife Photographer of the Year title in a contest that attracted a record 32,351 entries.
Catriona Parfitt, 15, entered a picture of a lion poised to launch an attack on a giraffe near a watering hole in Namibia.
She said: 'As it walked slowly towards the waterhole at Hobatere Lodge in Namibia, this solitary giraffe kept looking over towards four lions on a nearby ridge.
'One of the lions, an ambitious young male, raced down from the ridge to chase the giraffe for some distance, watched by the assembled oryx.'
Lions are the giraffe's main predators, and giraffes are particularly vulnerable to attack when lying down, drinking or feeding from the ground. Unlike females, male giraffes tend to live alone, which also makes them more open to predation.
Winning shot: Catriona Parfitt's picture of a lion stalking a giraffe
Competition judge Rosamund Kidman Cox described her shot as 'astonishing'.
She added: 'Stage, action, story and onlookers combine to make an unforgettable scene.'
Catriona was honoured at the Wildlife Photographer of the Year ceremony at the Natural History Museum in London on Wednesday.
Steve Winter took the overall adult prize for his shot of a snow leopard. The American said: 'After 10 months and a winter with little snow in Ladakh's Hemis High Altitude National Park, India, I was running out of hope of getting the picture I wanted.
'But one freezing morning I checked my remote-controlled camera and found a snow leopard had triggered it the night before, in the frame I'd dreamed of – in its true element.'
Snow leopards are adapted to life in the mountains of central Asia.
Beauty: Snowstorm leopard winner of the Gerald Durrell Award for Endangered Wildlife.
They have long, waterproof outer fur, dense woolly under-fur and large nasal cavities that warm the air as they breathe it in.
This allows them to survive temperatures as low as -40°C. But the leopards can also tolerate the heat of the Gobi Desert, where temperatures can reach 40°C.
Yongkang Zhutook top prize in the animals in the environment category for her snowy snap of swans.
She said: 'To photograph the swans in their environment meant I had to endure the same conditions - snowstorms and high winds that roll the snow across the flat land in great waves.
Winner: A whooper swan comes in to land on Rongcheng Swan Lake in eastern China in Yongkang Zhu's photo
'The storm was so bitter I wished I could have escaped along with the swans.'
Every winter, huge flocks of whooper swans migrate from the far north of Europe and Asia to warmer lowlands. The Rongcheng Swan Lake nature reserve in eastern China is a major overwintering sanctuary for whooper swans.
But even here, when the fresh water freezes, the birds are forced to feed in the fields, digging through the snow for grass.
Italian Stefano Unterthiner took the top prize in the Animal Portraits group for this shot of a macaque monkey.
Winner: A quizzical macaque monkey stares at the cameraman in Indonesia
He told the judges: 'I nicknamed this young adult Troublemaker. He was interested in me, so getting a close-up wasn't difficult. But he would leap at me and kick off my back like a trampoline.
'It was part play, part confrontation, part attention-seeking, part curiosity. I think Troublemaker's expression captures the spirit of these wonderful monkeys.'
Black-crested macaques live on the Indonesian island of Sulawesi. They usually forage in the forests, but sometimes their search for food takes them to the edge of the trees to the coast. They wander along the beach scouring the rocks for fallen fruits and nuts or, in the case of the young ones, paddling in the waves.
Antoni Kasprzak amazing picture of fighting white-tailed eagles in his native Poland won the Animal Behaviour category.
Majestic: Battling white-tailedf eagles fight over carrion in the mountains of southern Poland
He said: 'Photographing in Poland, I found a dead moose that would be ideal bait. Five hours later, an adult and an immature white-tailed eagle arrived together, and a struggle broke out.
'The older, more experienced bird won, forcing the immature eagle to wait its turn for more than an hour, along with other scavengers.'
White-tailed eagles are the largest eagles in northern Europe, with a wingspan of more than two metres. Mature birds have a yellow beak, while the juveniles are a darker brown.
Eagles will swoop and catch fish, but will also feed on carrion. When winter is particularly cold, and food is scare, fights over food break out.
Amazing pictures: British teenager takes young Wildlife Photographer of the Year | Mail Online