background preloader

Dolphins & Porpoise

Facebook Twitter

Dolphins & Other Animals

This Is The World As A Dolphin ‘Sees’ It. Dolphins in the waters off Mayotte. Orcas are first non-humans whose evolution is driven by culture. John Durban, NOAA Southwest Fisheries Science Center; research authorised by NMFS (US) By Colin Barras You could call it a culture shock.

Orcas are first non-humans whose evolution is driven by culture

Many researchers accept that cultural experiences have helped shape human evolution – and evidence has now emerged that the same may be true of killer whales. Human genomes have evolved in response to our cultural behaviours: a classic example is the way that some human populations gained genes for lactose tolerance following the onset of dairy farming. But whether genomes and culture co-evolve in other animal species has been unclear. Andrew Foote at the University of Bern, Switzerland, and his colleagues suspected that killer whales might follow a similar pattern to humans.

Advertisement Cosmopolitan whales. Leaping Dolphin. First new river dolphin species found since World War I. Dolphins learn tool-usage from mother. Sponge Moms: Dolphins learn tool use from their mothers Susan Milius Bottlenose dolphins that carry sea sponges on their beaks probably learned the trick from their moms rather than inheriting a sponge-shuttling gene, researchers say.

Dolphins learn tool-usage from mother

LIKE A GLOVE. A female bottlenose dolphin in Shark Bay, Australia, wraps her sensitive beak with a sea sponge. The covering probably protects against scrapes and stings while the dolphin searches for food along the ocean bottom. J. The sponges appear to protect the dolphins' beaks during foraging along rugged ocean bottoms, explains Michael Krützen of the University of Zurich in Switzerland. World’s Smallest Porpoise Is on the Verge of Extinction. The world’s smallest and rarest porpoise, the vaquita, is on the verge of extinction.

World’s Smallest Porpoise Is on the Verge of Extinction

A mere 60 remain, the Mexican government announced Friday. Their numbers have dropped 40 percent in two years, down from 97 in 2014, due in large part for illegal fishing for another endangered species. The totoaba, a fish whose swim bladder is highly prized as a delicacy in Asia, is caught using prohibited gillnets. Those nets have holes that are just the right size to trap—and drown—vaquitas, too. Dolphin jumps in front of boat. Ban On Tuna Labeled Dolphin-Safe Shows How TPP Will Crush Consumer Rights.

(ANTIMEDIA) In the last 25 years, dolphin-safe labeling of tuna managed to reduce unnecessary annual deaths of the mammals from over 100,000 to only 3,000—an astounding 97% reduction—but the World Trade Organization just effectively nullified this critical program.

Ban On Tuna Labeled Dolphin-Safe Shows How TPP Will Crush Consumer Rights

In order to placate Mexico as a member nation of the upcoming (and seemingly inevitable) Trans-Pacific Partnership (TPP), the WTO deemed dolphin-safe labeling a “technical barrier to trade”—even though that environmentally-conscious label is voluntary and applies equally to domestic and foreign companies. At issue are fishing methods that exploit the as-yet-unexplained symbiotic relationship between tunas and dolphins. As the Sierra Club explained: Tunas and dolphins are commonly found together in the Eastern Pacific Ocean. New species of dolphin discovered off Australia. Australian researchers have discovered a new species of dolphin living right under their, uh, bottlenoses.

New species of dolphin discovered off Australia

Freshwater Boto Dolphin of the Amazon. Maui's dolphin danger: 'We're running out of time' The last remaining 55 of world's rarest species of dolphins could disappear within three decades if New Zealand doesn't act now, wildlife advocates say.

Maui's dolphin danger: 'We're running out of time'

The Last 55 campaign was launched by WWF-New Zealand at the Maritime Museum in Auckland today, calling on the Government to extend protection of marine reserves to cover the habitats of Maui's dolphins. The campaign launched a petition to attempt to collect 55,000 signatures before this year's general election. "Today, WWF is saying enough is enough. We're running out of time," said WWF-NZ executive director Chris Howe. "It is election year, and we believe all politicians must act. " Maui's dolphins are an inshore coastal species with limited home range, slow to breed, and only found in the West Coast of the North Island.

The species has been in rapid decline since the fishing practice of set-netting and trawling was introduced during the 1970s, when the dolphins numbered around 1800. Happy Dolphins. Dolphin vs Porpoise - Difference and Comparison. Dolphins and porpoises are both cataceans, i.e. marine mammals, and are closely related to whales.

Dolphin vs Porpoise - Difference and Comparison

Dolphins belong to the family Delphinidae and are up to 30 feet long. Porpoises, belonging to family Phocoenidae are smaller, but stouter than dolphins. Orca hunting penguin. Recently Spotted 103-Year-Old Orca Is Bad News For SeaWorld. Why Does a Killer Whales Dorsal Fin Collapse? Question: Killer Whale (Orca) Dorsal Fin Collapse Have you ever wondered why killer whales in captivity have a dorsal fin that is flopped over, or 'collapsed?

Why Does a Killer Whales Dorsal Fin Collapse?

' Read on to learn the theories. Answer: A male killer whale's dorsal fin can grow to as much as 6 feet tall. Despite the fact that the dorsal fin is very straight, it is not supported by bone, but a fibrous connective tissue called collagen. A wild orca often travels far, and quickly, in deep water. That said, it is not impossible for a wild orca's dorsal fin to collapse or become bent. In captivity, dorsal fin collapse may be related to several factors, including time spent at the water surface, swimming in the same direction in a relatively small pool. Another Monday morning on Utila.