Since sea otters sleep at sea, floating around like in the video, holding hands like that keeps the group together, so they don't drift apart in the night. Because of this, the otters feel more comfortable holding hands while asleep than drifting alone. Therefore, it serves both social and practical purpose.

This is the porcupine crab (Neolithodes grimaldii), found in the deep sea bed along the continental slopes of the Atlantic Ocean. A member of the king crab family, its carapace, or body, can stretch up to 18 cm long, and it can weigh over 2 kg. But that's nothing compared to the blue king crab (Paralithodes platypus) from Alaska, which weighs a whopping 8 kg. ...

This is the Green vine snake (Ahaetulla nasuta), a slender tree snake found in India, Sri Lanka, Bangladesh, Burma, Thailand, Cambodia and Vietnam.

The snake is mildly venomous, and its bite causes swelling and pain. They feed on frogs and lizards. There is a widespread myth in parts of southern India that the species uses its pointed head to blind its human victims!

This is the emerald toucanet, and it can be found camouflaging very nicely in the mountainous forests of Mexico, Central America, Venezuela and along the Andes. These beautiful birds are extremely intelligent - when reared by hand in captivity, they can learn tricks as fast as cockatoos.

This is the Caqueta titi monkey, and its babies purr just like cats when they're happy. It is one of more than 400 new species of animals and plants that have been discovered in the past four years in the Amazon rainforest, along with a vegetarian piranha and a flame-patterned lizard.

The Monticello Dam holds back Lake Berryessa in Napa County, California, USA. The morning glory spillway associated with the dam is the largest in the world; it is a funnel-shaped outlet that allows water to bypass the Monticello Dam when it reaches capacity (1370 m³/s).

The Glory Hole is located about 61m from the dam; the distance from the funnel to the exit point - which is situated in the south side of the canyon - is about 213m. The outside diameter is 22m, slowly narrowing to 8.5m at the exit.

Water spills over the lip of the Glory Hole when the lake reaches 1,976,037,908 cubic metres (1,602,000 acre-feet). The spillway is designed to handle a maximum of 1,370,319 litres of water per second (362,000 gallons of water per second); this ha ...

The destructive power of humans.

It’s raining diamonds in Jupiter and Saturn. Dr. Kevin Bates from the University of Wisconsin-Madison said that lightning storms in these two planets turn methane into soot. As it falls, soot hardens into chunks of graphite and then diamonds. Bates speculates that about 1,000 tonnes of diamonds are produced on Saturn every year.