Scores of disembowelled sharks have washed up on a South African beach putting the spotlight on a pair of shark-hunting killer whales whose behaviour has fascinated scientists and wildlife enthusiasts.
Ecology
Mar 4, 2023
0
114
When you think about human evolution, there's a good chance you're imagining chimpanzees exploring ancient forests or early humans daubing wooly mammoths on to cave walls. But we humans, along with bears, lizards, hummingbirds ...
Evolution
Mar 3, 2023
0
271
Southern right whales adjusted their foraging grounds over the past 30 years as climate change altered where prey could be found, according to a University of Auckland, Waipapa Taumata Rau scientist.
Plants & Animals
Mar 1, 2023
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106
The boundaries between biology and technology are becoming blurred. Researchers at Linköping, Lund and Gothenburg universities in Sweden have successfully grown electrodes in living tissue using the body's molecules as triggers. ...
Biotechnology
Feb 23, 2023
2
369
Passengers and crew aboard the National Geographic cruise ship Endurance as it sailed parts of Antarctica got more than expected last year when the ship happened to pass through a huge group of whales foraging together.
Sharks, along with rays, and their products have been historically consumed and traded by many communities globally over centuries. Between 2012 and 2019, the trade in shark and ray meat was valued at over US$4.1 billion.
Plants & Animals
Feb 1, 2023
0
20
The CT-scanned skull of a 319-million-year-old fossilized fish, pulled from a coal mine in England more than a century ago, has revealed the oldest example of a well-preserved vertebrate brain.
Evolution
Feb 1, 2023
0
198
Hundreds of dolphins are washing up on France's Atlantic coast and thousands more are believed killed in fishermen's nets each year, as environmentalists and Brussels pressure the government to protect the marine mammals.
Ecology
Jan 25, 2023
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35
A rare three-dimensional fossil of an ancient chimaera has revealed new clues about the diversity of these creatures in the Carboniferous period, some 300 million years ago.
Paleontology & Fossils
Jan 17, 2023
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60
The more than 1.2 million km of fiber-optic cables that crisscross the planet carry the world's phone calls, internet signals and data. But this summer, researchers published the eerie sounds of blue and fin whales detected ...
Earth Sciences
Jan 12, 2023
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204
A fin is a surface used for stability and/or to produce lift and thrust or to steer while traveling in water, air, or other fluid media, (in other words, a foil (fluid mechanics)). The first use of the word was for the limbs of fish, but has been extended to include other animal limbs and man-made devices. Fins, as with other foils, operate in fluids such as water or air.
Fins are seen both in nature and in manmade iterations.
Swimming water animals such as fish and cetaceans actively use pectoral fins for maneuvering, and dorsal fins contribute stability as the animal swims, propelling and maneuvering with its tail, itself recognizable as a fin.
The fin on fixed-wing aircraft is known as a vertical stabilizer. Fins are also seen used as e.g., fletching on arrows and at the rear of some bombs, missiles, rockets, and self-propelled torpedoes. These are typically "planar" (shaped like small wings), although grid fins are sometimes used in specialized cases.
Examples of fins include:
This text uses material from Wikipedia, licensed under CC BY-SA
