Two Hours of 4K Nature Scenes | 4KUHD | BBC Earth

Jellyfish drift in ocean currents, feeding on plankton and growing to sizes of up to two meters across.

Portuguese man of war uses a gas-filled bladder to float and trails long threads armed with stinging cells that can kill fish or humans.

A minor war fish feeds on the tentacles of the Portuguese man of war, developing resistance to the stings but must remain cautious.

Spider crabs in Australia gather by the hundreds of thousands to molt, creating great mounds for protection in numbers.

Smooth sting rays prey on newly molted, weakened crabs, but most crabs manage to escape and return to their depths.

Foot crabs in Brazil wait for low tides to expose feeding grounds, risking predation from moray eels and octopuses.

Poison dart frogs exhibit unique parenting where fathers carry tadpoles in tiny pools of water and mothers provide unfertilized eggs for food.

Saddleback clownfish live among the tentacles of a carpet anemone, immune to its poison, and in return, they clean the anemone.

A hermit crab and anemone work together to move a coconut shell for a safe nursery for their eggs.

Macaque monkeys face challenges in raising their young, with risks of kidnapping and the need for cooperative strategies.

Sea snakes, with highly toxic venom, are hunted by experienced fishermen on the island of Kuka for their skin and meat.

Blue sharks travel thousands of kilometers, using currents and their sense of smell to locate meals such as whale carcasses.

Red flying foxes in Australia hang upside down to rest and must risk drinking from the water to stay hydrated.

Crocodiles in Australia have survived since prehistoric times and continue to be a formidable presence in the region's rivers.

The Coral Triangle in Southeast Asia is home to some of the world's richest coral reefs, with intense competition for space and resources.

Cuttlefish can change colors and patterns to hypnotize crabs before attacking, but are also prey for larger predators like sharks.

Giant cuttlefish gather in the Indian Ocean to breed, with males competing for females and employing trickery to mate.

Hyenas in the Namib Desert must travel long distances to find food like seal pups to feed their families.

Tasmanian devils are endangered and found only in a few places, including the island of Tasmania, where they are a unique and powerful predator.

Deer in Hokkaido, Japan, have adapted to live alongside humans, feeding on crops and coexisting with local farmers.

Red-crowned cranes in Japan have learned to nest in farmland waterways, adapting to the loss of their traditional marsh habitats.

Tree frogs in Japan build foam nests to protect their eggs, timing their development with the summer rains for a perfect release into the paddy pools below.

Giant cuttlefish in Japan undergo a transformation where females can change into males, allowing for more mating opportunities.

Whale sharks, once hunted for their valuable meat, are now protected in Indonesian waters, leading to increased numbers and unique interactions with fishermen.

The American deserts are home to unique descendants of dinosaurs, like the road runner, which has adapted to the harsh conditions.

Puffins in the Arctic face challenges in raising their chicks, with long fishing trips and the risk of pirates stealing their catch.

Deep-sea creatures use bioluminescence for communication and predation, existing in a world beyond the reach of sunlight.

The seafloor, covered in a layer of mud from marine snow, is home to unique dwellers like the sea toad and octopus that have adapted to this environment.

King penguins in South Georgia must leave their chicks unattended while they feed at sea, relying on vocal recognition to reunite.

Black bears in the Kalahari Desert must navigate the challenges of finding food for their cubs while avoiding territorial males.

Aardvarks in the Kalahari have faced food scarcity due to droughts, affecting their ability to find termites, their primary food source.

Climate change threatens the future of many African animals, with predictions of increased warming and its consequences.

Mangoes in the forest canopy provide a sweet reward for young primates learning to navigate the treetops and find food.

Brine pools in the Gulf of Mexico support unique life forms like giant mussels that can live for over a century.

Humboldt penguins in Peru use guano to dig nest holes, facing challenges from the messy material and crowded beaches with sea lions.

Brown bears in Finland's forests face the upcoming winter and the need to prepare their cubs for the harsh conditions.

Japanese fishermen and brown bears coexist in Hokkaido, both relying on the salmon run for survival.

Macaques in Japan raid farmers' crops despite electric fences and specially trained dogs meant to deter them.

The Kuroshio current allows for coral growth in Japan and supports a vibrant ecosystem including cleaner fish and manta rays.