The natural world is full of astonishing spectacles and behaviours \u2013 and while we have already unravelled many of its mysteries, there\u2019s no doubt that there are more discoveries to be made.<\/p>\n
One of the ways we can learn more about the animals of this world is to film them in their own, undisturbed habitats. The BBC has become renowned for this, as part of its pioneering natural history programming.<\/p>\n
This dates to the 1940s, when its natural history content expanded from radio to TV. By 1957, the Natural History Unit was formalised as a hub for wildlife programming.<\/p>\n
Now, the department is celebrating 20 years since its groundbreaking series Planet Earth. Its epic scale, focus on unusual species and behaviours and cinematic quality made it both a critical and commercial success. Planet Earth\u2019s legacy can be seen in video clips that continuously surprise viewers around the world, as well as the follow-up series Planet Earth II<\/a> and Planet Earth III<\/a>.<\/p>\n 10 animal behaviours filmed for the first time<\/p>\n Vampire squid glowing in the dark<\/p>\n In the deep sea, many creatures have developed a practical way of navigating its dark depths: they can glow in the dark. And the vampire squid<\/a> is no exception. To confuse predators, and to perhaps make a quick getaway, bioluminescent bacteria shines from pockets on its arms. \u00a0<\/p>\n Nautilus hunting in the dark<\/p>\n The nautilus is probably one of the weirdest octopuses<\/a> in the world. Firstly, it creates a \u2018shell\u2019 of sorts. Secondly, its shell contains gas-filled flotation chambers that controls its depth when moving between deep and shallow waters to feed. It also moves across the sea using a jet of water squirting from a siphon.<\/p>\n Venomous sea snakes hunt with fish<\/p>\n As sea snakes<\/a> aren\u2019t fast swimmers and their prey (smaller fish) is much quicker, they\u2019ve developed an incredible hunting strategy: by teaming up with big fish. Working together, they drive smaller fish into the nooks and crannies of the seabed. There, they become easy prey for the sea snakes, with the larger fish waiting for any escapees.<\/p>\n This is an example of mutualism, where different species work together for the mutual benefit of both.<\/p>\n Parasitic cordyceps take over<\/p>\n You really wouldn\u2019t want to encounter a bullet ant in the jungle. They have the most painful sting on the planet<\/a>, which can leave humans in agony for hours \u2013 but that doesn\u2019t mean they\u2019re indestructible.<\/p>\n Spores from a parasitic fungus<\/a> called cordyceps take over an ant, feeding on its innards. After the ant has died, the fungus will send a fruiting body out of its body, allowing more spores to spread. The cordyceps fungus is so effective that it can wipe out an entire ant colony.<\/p>\n Wolves hunt caribou<\/p>\n In the far north of Canada, thousands of reindeer<\/a> (or caribou) migrate during the winter. And while they\u2019re almost constantly on the move, they face threats from wolves<\/a>, who can keep up the chase for over 10 kilometres. The Planet Earth team managed to film an entire hunt for the first time, thanks to the long lens capability of a camera system mounted on a chopper.<\/p>\n Snow leopard hunts markhor<\/p>\n Often found in the Himalayas, the snow leopard<\/a> is an elusive big cat that is perfectly at home on remote and steep slopes. But while the snow leopard finds the dizzying heights reasonable, this does make it a particularly difficult creature to film. However, the Planet Earth team managed to capture the first close-up images of a snow leopard filmed in the wild.<\/p>\n Surfing dolphins<\/p>\n On the coast of Western Australia, a pod of eight dolphins developed a particularly unusual hunting method: hydroplaning. By heading to shallower waters, they can eat more fish. But it does leave them at risk of stranding.<\/p>\n Lions take down an elephant<\/p>\n Lions<\/a> don\u2019t usually hunt elephants, but as this footage shows, they can work in a pack to do so if they\u2019re really desperate<\/a>. They aim for the easier target of a calf \u2013 and when one finds itself cut off from its herd, the lions charge towards it.<\/p>\n Polar bear takes on walrus herd<\/p>\n Polar bears<\/a> are the world\u2019s largest land carnivore and with an excellent sense of smell and a powerful bite force, they\u2019re a powerful apex predator. While they usually hunt seals, they sometimes scavenge on whale carcasses. And if they\u2019re really in need of a meal, they\u2019ll also risk the sharp tusks of a walrus<\/a>.<\/p>\n Sailfish coordinate to hunt<\/p>\n