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whale : any of various very large, aquatic, marine mammals (order Cetacea) that have a torpedo-shaped body with a thick layer of blubber, paddle-shaped forelimbs but no hind limbs, a horizontally flattened tail, and nostrils that open externally at the top of the head — Webster
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Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. They are an informal grouping within the infraorder Cetacea, usually excluding dolphins and porpoises. Whales are creatures of the open ocean; they feed, mate, give birth, suckle and raise their young at sea. So extreme is their adaptation to life underwater that they are unable to survive on land. Whales range in size from the 2.6 metres (8.5 ft) and 135 kilograms (298 lb) dwarf sperm whale to the 29.9 metres (98 ft) and 190 metric tons (210 short tons) blue whale, which is the largest creature that has ever lived. The sperm whale is the largest toothed predator on earth. Several species exhibit sexual dimorphism, in that the females are larger than males. Baleen whales have no teeth; instead they have plates of baleen, a fringe-like structure used to expel water while retaining the krill and plankton which they feed on. They use their throat pleats to expand the mouth to take in huge gulps of water. Balaenids have heads that can make up 40% of their body mass to take in water. Toothed whales, on the other hand, have conical teeth designed for catching fish or squid. Baleen whales have a well developed sense of “smell”, whereas toothed whales have well-developed hearing − their hearing, that is adapted for both air and water, is so well developed that some can survive even if they are blind. Some species, such as sperm whales, are well adapted for diving to great depths to catch squid and other favoured prey.– Wikipedia
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Dolphins and Whales News -- ScienceDaily Whales and dolphins. Whale songs, beaching, endangered status -- current research news on all cetaceans.
- Know your ally: Cooperative male dolphins can...on April 22, 2021 at 1:38 pm
When it comes to friendships and rivalries, male dolphins know who the good team players are. New findings reveal that male dolphins form a social concept of team membership based on cooperative investment in the team.
- Skin deep: Aquatic skin adaptations of whales and...on April 1, 2021 at 3:28 pm
A new study shows that the similarly smooth, nearly hairless skin of whales and hippopotamuses evolved independently. The work suggests that their last common ancestor was likely a land-dwelling mammal, uprooting current thinking that the skin came fine-tuned for life in the water from a shared amphibious ancestor.
- Genetic sleuthing reveals endangered river...on March 29, 2021 at 1:48 pm
New genetic analysis and years of painstaking research has revealed that one of the world's most endangered marine mammals is actually two species rather than one, as scientists had long assumed.
- Gray's beaked whales 'resilient' to ecosystem...on March 26, 2021 at 2:46 pm
An elusive whale species in the Southern Ocean could be resilient to near-future ecosystem changes, according to a new study.
- Ocean's mammals at crucial crossroadson March 25, 2021 at 7:01 pm
The ocean's mammals are at a crucial crossroads - with some at risk of extinction and others showing signs of recovery, researchers say.
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
- Leonardo da Vinci definitely did not sculpt the...on April 16, 2021 at 2:58 pm
"It is machination, it is deception," said the director general of the Berlin Royal Museums in his defense when criticized for buying a fake. Wilhelm Bode did not budge an inch: The sculpture he acquired in 1909 was an as-yet unknown production of the great Renaissance master Leonardo da Vinci.
- Environmental protection could benefit from...on April 15, 2021 at 4:59 pm
Scientists at the University of Southampton have conducted a study that highlights the importance of studying a full range of organisms when measuring the impact of environmental change—from tiny bacteria, to mighty whales.
- New research finds oceanic upwelling defies prior...on April 14, 2021 at 1:23 pm
A new scientific discovery in Australia by Flinders University has recorded for the first time how ghost currents and sediments can 'undo' the force of gravity.
- 4 gray whales found dead in San Francisco Bay...on April 10, 2021 at 8:56 am
Four dead gray whales have washed ashore San Francisco Bay Area beaches in the last nine days, with experts saying Friday one was struck by a ship. They were trying to determine how the other three died.
- Two dead whales wash up on Bangladesh beachon April 10, 2021 at 8:56 am
Two dead whales have washed up on the same stretch of Bangladesh coastline in two days, officials said Saturday, raising suggestions that they were killed by sea pollution.